diff --git a/README.rst b/README.rst
index 9604c0ee..33b1b570 100644
--- a/README.rst
+++ b/README.rst
@@ -52,7 +52,7 @@ What is ``Dependency Injector``?
 
 ``Dependency Injector`` is a dependency injection framework for Python.
 
-It helps you in implementing the dependency injection principle.
+It helps implementing the dependency injection principle.
 
 What is dependency injection?
 -----------------------------
diff --git a/docs/containers/index.rst b/docs/containers/index.rst
index 1e5d7c33..c1abec16 100644
--- a/docs/containers/index.rst
+++ b/docs/containers/index.rst
@@ -1,3 +1,5 @@
+.. _containers:
+
 Containers
 ==========
 
diff --git a/docs/images/internals.png b/docs/images/internals.png
deleted file mode 100644
index f49ecc8d..00000000
Binary files a/docs/images/internals.png and /dev/null differ
diff --git a/docs/index.rst b/docs/index.rst
index 168ef255..e1eb64c7 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -64,22 +64,49 @@ Dependency Injector --- Dependency injection framework for Python
 
 ``Dependency Injector`` is a dependency injection framework for Python.
 
-It stands on two principles:
+It helps implementing the dependency injection principle.
 
-- Explicit is better than implicit (PEP20).
-- Do no magic to your code.
+Key features of the ``Dependency Injector``:
 
-How does it different from the other frameworks?
+- **Providers**. Provides ``Factory``, ``Singleton``, ``Callable``, ``Coroutine``, ``Object``,
+  ``List``, ``Configuration``, ``Dependency`` and ``Selector`` providers that help assembling your
+  objects. See :ref:`providers`.
+- **Overriding**. Can override any provider by another provider on the fly. This helps in testing
+  and configuring dev / stage environment to replace API clients with stubs etc. See
+  :ref:`provider-overriding`.
+- **Configuration**. Read configuration from ``yaml`` & ``ini`` files, environment variables
+  and dictionaries. See :ref:`configuration-provider`.
+- **Containers**. Provides declarative and dynamic containers. See :ref:`containers`.
+- **Performance**. Fast. Written in ``Cython``.
+- **Maturity**. Mature and production-ready. Well-tested, documented and supported.
 
-- **No autowiring.** The framework does NOT do any autowiring / autoresolving of the dependencies. You need to specify everything explicitly. Because *"Explicit is better than implicit" (PEP20)*.
-- **Does not pollute your code.** Your application does NOT know and does NOT depend on the framework. No ``@inject`` decorators, annotations, patching or any other magic tricks.
+.. code-block:: python
 
-``Dependency Injector`` makes a simple contract with you:
+   from dependency_injector import containers, providers
 
-- You tell the framework how to assemble your objects
-- The framework does it for you
 
-The power of the ``Dependency Injector`` is in its simplicity and straightforwardness. It is a simple tool for the powerful concept.
+   class Container(containers.DeclarativeContainer):
+
+       config = providers.Configuration()
+
+       api_client = providers.Singleton(
+           ApiClient,
+           api_key=config.api_key,
+           timeout=config.timeout.as_int(),
+       )
+
+       service = providers.Factory(
+           Service,
+           api_client=api_client,
+       )
+
+
+   if __name__ == '__main__':
+       container = Container()
+       container.config.api_key.from_env('API_KEY')
+       container.config.timeout.from_env('TIMEOUT')
+
+       service = container.service()
 
 With the ``Dependency Injector`` you keep **application structure in one place**.
 This place is called **the container**. You use the container to manage all the components of the
diff --git a/docs/introduction/index.rst b/docs/introduction/index.rst
index 3e7ce7cc..0c3588de 100644
--- a/docs/introduction/index.rst
+++ b/docs/introduction/index.rst
@@ -17,4 +17,3 @@ dependency injection pattern, inversion of control principle and
     what_is_di
     di_in_python
     key_features
-    structure
diff --git a/docs/introduction/key_features.rst b/docs/introduction/key_features.rst
index c2a1756f..3990e08c 100644
--- a/docs/introduction/key_features.rst
+++ b/docs/introduction/key_features.rst
@@ -3,66 +3,33 @@ Key features
 
 .. meta::
    :keywords: Python,DI,Dependency injection,IoC,Inversion of Control
-   :description: This article describes key features of "Dependency Injector" 
-                 framework. It also provides some cases and recommendations 
-                 about usage of "Dependency Injector" framework.
+   :description: This article describes key features of the Dependency Injector
+                 framework.
 
+Key features of the ``Dependency Injector``:
 
-``Dependency Injector`` is a dependency injection framework for Python.
-It was designed to be a unified and developer-friendly tool that helps
-implement a dependency injection design pattern in a formal, pretty, and
-Pythonic way.
+- **Providers**. Provides ``Factory``, ``Singleton``, ``Callable``, ``Coroutine``, ``Object``,
+  ``List``, ``Configuration``, ``Dependency`` and ``Selector`` providers that help assembling your
+  objects. See :ref:`providers`.
+- **Overriding**. Can override any provider by another provider on the fly. This helps in testing
+  and configuring dev / stage environment to replace API clients with stubs etc. See
+  :ref:`provider-overriding`.
+- **Configuration**. Read configuration from ``yaml`` & ``ini`` files, environment variables
+  and dictionaries. See :ref:`configuration-provider`.
+- **Containers**. Provides declarative and dynamic containers. See :ref:`containers`.
+- **Performance**. Fast. Written in ``Cython``.
+- **Maturity**. Mature and production-ready. Well-tested, documented and supported.
 
-It stands on two principles:
+The framework stands on two principles:
 
-- Explicit is better than implicit (PEP20).
-- Do no magic to your code.
+- **Explicit is better than implicit (PEP20)**.
+- **Do not do any magic to your code**.
 
-How does it different from the other frameworks?
+How is that different from the other frameworks?
 
 - **No autowiring.** The framework does NOT do any autowiring / autoresolving of the dependencies. You need to specify everything explicitly. Because *"Explicit is better than implicit" (PEP20)*.
 - **Does not pollute your code.** Your application does NOT know and does NOT depend on the framework. No ``@inject`` decorators, annotations, patching or any other magic tricks.
 
-``Dependency Injector`` makes a simple contract with you:
-
-- You tell the framework how to build you code
-- The framework does it for you
-
-The power of the ``Dependency Injector`` is in its simplicity and straightforwardness. It is a simple tool for the powerful concept.
-
-The key features of the ``Dependency Injector`` framework are:
-
-+ Easy, smart, and Pythonic style.
-+ Does NOT pollute client code.
-+ Obvious and clear structure.
-+ Extensibility and flexibility.
-+ High performance.
-+ Memory efficiency.
-+ Thread safety.
-+ Documented.
-+ Semantically versioned.
-+ Distributed as pre-compiled wheels.
-
-``Dependency Injector`` containers and providers are implemented as C extension
-types using ``Cython``.
-
-``Dependency Injector`` framework can be used in the different application types:
-
-+ Web applications based on the ``Flask``, ``Django`` or any other web framework.
-+ Asynchronous applications ``asyncio``, ``aiohttp``, ``Tornado``, or ``Twisted``.
-+ Standalone frameworks and libraries.
-+ GUI applications.
-
-``Dependency Injector`` framework can be integrated on the different project
-stages:
-
-+ It can be used in the beginning of the development of a new application.
-+ It can be integrated into application that is on its active development stage.
-+ It can be used for refactoring of legacy application.
-
-Components of ``Dependency Injector`` framework could be used:
-
-+ In composition with each other.
-+ Independently from each other.
+The power of the framework is in a simplicity. ``Dependency Injector`` is a simple tool for the powerful concept.
 
 .. disqus::
diff --git a/docs/introduction/structure.rst b/docs/introduction/structure.rst
deleted file mode 100644
index 195b3d39..00000000
--- a/docs/introduction/structure.rst
+++ /dev/null
@@ -1,50 +0,0 @@
-Structure of Dependency Injector
---------------------------------
-
-.. meta::
-   :keywords: Python,DI,Dependency injection,IoC,Inversion of Control
-   :description: This article describes "Dependency Injector" framework 
-                 components and their interaction between each other. 
-                 Providers and containers are the former components of 
-                 the framework.
-
-Current section describes *Dependency Injector* main entities and their 
-interaction between each other.
-
-.. image:: /images/internals.png
-    :width: 100%
-    :align: center
-
-There are 2 main entities: providers & containers.
-
-Providers
-~~~~~~~~~
-
-Providers are strategies of accessing objects. For example, 
-:py:class:`dependency_injector.providers.Factory` creates new instance 
-of provided class every time it is called. 
-:py:class:`dependency_injector.providers.Singleton` creates provided 
-instance once and returns it on every next call. Base class is - 
-:py:class:`dependency_injector.providers.Provider`.
-
-Providers could be:
-
-+ Injected into each other.
-+ Overridden by each other.
-+ Extended.
-
-Containers 
-~~~~~~~~~~
-
-Containers are collections of providers. They are used for grouping 
-of providers by some principles. Base class is - 
-:py:class:`dependency_injector.containers.DeclarativeContainer`.
-
-Containers could be:
-
-+ Overridden by each other.
-+ Copied from each other.
-+ Extended.
-
-
-.. disqus::
diff --git a/docs/main/changelog.rst b/docs/main/changelog.rst
index 498ab0e3..3f5a0db0 100644
--- a/docs/main/changelog.rst
+++ b/docs/main/changelog.rst
@@ -7,6 +7,14 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+3.37.0
+------
+- Update index documentation page.
+- Make multiple improvements and fixes for the providers documentation.
+- Update "Key Features" documentation page.
+- Remove "Structure of Dependency Injector" documentation page.
+- Edit "Feedback" documentation page.
+
 3.36.0
 ------
 - Update providers overriding documentation and rework examples.
diff --git a/docs/main/feedback.rst b/docs/main/feedback.rst
index dc51dae2..94b86658 100644
--- a/docs/main/feedback.rst
+++ b/docs/main/feedback.rst
@@ -1,12 +1,8 @@
 Feedback
 ========
 
-Feel free to post questions, bugs, feature requests, proposals etc. on
-*Dependency Injector*  GitHub Issues:
-
-    https://github.com/ets-labs/python-dependency-injector/issues
-
-Your feedback is quite important!
-
+To post a question, bug report, a feature proposal or get some help open a
+`Github Issue <https://github.com/ets-labs/python-dependency-injector/issues>`_ or leave a comment
+below.
 
 .. disqus::
diff --git a/docs/providers/configuration.rst b/docs/providers/configuration.rst
index 9d049e18..496cb69d 100644
--- a/docs/providers/configuration.rst
+++ b/docs/providers/configuration.rst
@@ -1,3 +1,5 @@
+.. _configuration-provider:
+
 Configuration provider
 ======================
 
@@ -14,8 +16,8 @@ Configuration provider
 
 .. literalinclude:: ../../examples/providers/configuration/configuration.py
    :language: python
-   :emphasize-lines: 4,9-10
-   :lines: 4-14
+   :emphasize-lines: 7,12-13
+   :lines: 3-
 
 It implements the principle "use first, define later".
 
@@ -27,8 +29,8 @@ Loading from an INI file
 
 .. literalinclude:: ../../examples/providers/configuration/configuration_ini.py
    :language: python
-   :lines: 3-5,6-
-   :emphasize-lines: 6
+   :lines: 3-
+   :emphasize-lines: 12
 
 where ``examples/providers/configuration/config.ini`` is:
 
@@ -47,8 +49,8 @@ Loading from a YAML file
 
 .. literalinclude:: ../../examples/providers/configuration/configuration_yaml.py
    :language: python
-   :lines: 3-5,6-
-   :emphasize-lines: 6
+   :lines: 3-
+   :emphasize-lines: 12
 
 where ``examples/providers/configuration/config.yml`` is:
 
@@ -81,8 +83,8 @@ Loading from a dictionary
 
 .. literalinclude:: ../../examples/providers/configuration/configuration_dict.py
    :language: python
-   :lines: 3-5,6-
-   :emphasize-lines: 6-13
+   :lines: 3-
+   :emphasize-lines: 12-19
 
 Loading from an environment variable
 ------------------------------------
@@ -92,8 +94,8 @@ Loading from an environment variable
 
 .. literalinclude:: ../../examples/providers/configuration/configuration_env.py
    :language: python
-   :lines: 5-7,13-21
-   :emphasize-lines: 6-8
+   :lines: 3-
+   :emphasize-lines: 18-20
 
 Loading from the multiple sources
 ---------------------------------
@@ -103,8 +105,8 @@ configuration is merged recursively over the existing configuration.
 
 .. literalinclude:: ../../examples/providers/configuration/configuration_multiple.py
    :language: python
-   :lines: 3-5,6-14
-   :emphasize-lines: 6-7
+   :lines: 3-
+   :emphasize-lines: 12-13
 
 where ``examples/providers/configuration/config.local.yml`` is:
 
@@ -122,7 +124,7 @@ convert it into an ``int`` or a ``float``.
 .. literalinclude:: ../../examples/providers/configuration/configuration_type.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 17
+   :emphasize-lines: 19
 
 ``Configuration`` provider has next helper methods:
 
@@ -135,10 +137,27 @@ The last method ``.as_(callback, *args, **kwargs)`` helps to implement other con
 .. literalinclude:: ../../examples/providers/configuration/configuration_type_custom.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 16
+   :emphasize-lines: 18
 
 With the ``.as_(callback, *args, **kwargs)`` you can specify a function that will be called
 before the injection. The value from the config will be passed as a first argument. The returned
 value will be injected. Parameters ``*args`` and ``**kwargs`` are handled as any other injections.
 
+Injecting invariants
+--------------------
+
+You can inject invariant configuration options based on the value of the other configuration
+option.
+
+To use that you should provide the switch-value as an item of the configuration option that
+contains sections ``config.options[config.switch]``:
+
+- When the value of the ``config.switch`` is ``A``, the ``config.options.A`` is injected
+- When the value of the ``config.switch`` is ``B``, the ``config.options.B`` is injected
+
+.. literalinclude:: ../../examples/providers/configuration/configuration_itemselector.py
+   :language: python
+   :lines: 3-
+   :emphasize-lines: 15,30-31,38
+
 .. disqus::
diff --git a/docs/providers/factory.rst b/docs/providers/factory.rst
index 626cda8c..a4e2aa29 100644
--- a/docs/providers/factory.rst
+++ b/docs/providers/factory.rst
@@ -73,7 +73,7 @@ all the classes and use special double-underscore ``__`` syntax for passing the
 .. literalinclude:: ../../examples/providers/factory_init_injections_underlying.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 24-35,39,42,45
+   :emphasize-lines: 44,49
 
 When you use ``__`` separator in the name of the keyword argument the ``Factory`` looks for
 the dependency with the same name as the left part of the ``__`` expression.
@@ -98,7 +98,7 @@ attribute of the provider that you're going to inject.
 .. literalinclude:: ../../examples/providers/factory_delegation.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 25
+   :emphasize-lines: 28
 
 .. note:: Any provider has a ``.provider`` attribute.
 
@@ -135,7 +135,7 @@ provider with two peculiarities:
 .. literalinclude:: ../../examples/providers/abstract_factory.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 32
+   :emphasize-lines: 34
 
 Factory aggregate
 -----------------
@@ -155,7 +155,7 @@ rest of the arguments are passed to the delegated ``Factory``.
 .. literalinclude:: ../../examples/providers/factory_aggregate.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 31-35,43
+   :emphasize-lines: 33-37,47
 
 You can get a dictionary of the aggregated factories using the ``.factories`` attribute of the
 ``FactoryAggregate``. To get a game factories dictionary from the previous example you can use
diff --git a/docs/providers/list.rst b/docs/providers/list.rst
index afd24a3d..5f2d3924 100644
--- a/docs/providers/list.rst
+++ b/docs/providers/list.rst
@@ -13,7 +13,7 @@ List provider
 .. literalinclude:: ../../examples/providers/list.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 19-22
+   :emphasize-lines: 21-24
 
 ``List`` provider handles positional arguments the same way as a :ref:`factory-provider`.
 
diff --git a/docs/providers/provided_instance.rst b/docs/providers/provided_instance.rst
index a53035cf..0bb7d664 100644
--- a/docs/providers/provided_instance.rst
+++ b/docs/providers/provided_instance.rst
@@ -14,7 +14,7 @@ You can inject provided object attribute, item or result of its method call.
 
 .. literalinclude:: ../../examples/providers/provided_instance.py
    :language: python
-   :emphasize-lines: 26-32
+   :emphasize-lines: 28-34
    :lines: 3-
 
 To use the feature you should use the ``.provided`` attribute of the injected provider. This
@@ -32,7 +32,7 @@ You can do nested constructions:
 
 .. literalinclude:: ../../examples/providers/provided_instance_complex.py
    :language: python
-   :emphasize-lines: 24-30
+   :emphasize-lines: 26-32
    :lines: 3-
 
 The ``.provided`` attribute is available for the next providers:
diff --git a/docs/providers/selector.rst b/docs/providers/selector.rst
index 6326e051..db3a8be3 100644
--- a/docs/providers/selector.rst
+++ b/docs/providers/selector.rst
@@ -17,7 +17,7 @@ Selector provider
 .. literalinclude:: ../../examples/providers/selector.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 14-18
+   :emphasize-lines: 16-20
 
 The first argument of the ``Selector`` provider is called ``selector``. It can be an option of
 a ``Configuration`` provider or any other callable. The ``selector`` callable has to return a
diff --git a/docs/providers/singleton.rst b/docs/providers/singleton.rst
index a3cc2d4d..6624777f 100644
--- a/docs/providers/singleton.rst
+++ b/docs/providers/singleton.rst
@@ -32,6 +32,13 @@ factories:
 - :ref:`factory-specialize-provided-type`
 - :ref:`abstract-factory`
 
+``Singleton`` provider scope is tied to the container. Two different containers will provider
+two different singleton objects:
+
+.. literalinclude:: ../../examples/providers/singleton_multiple_containers.py
+   :language: python
+   :lines: 3-
+
 Resetting memorized object
 --------------------------
 
@@ -41,7 +48,7 @@ provider.
 .. literalinclude:: ../../examples/providers/singleton_resetting.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 14
+   :emphasize-lines: 18
 
 .. note::
    Resetting of the memorized object clears the reference to it. Further object's lifecycle is
@@ -64,7 +71,7 @@ There are two thread-safe singleton implementations out of the box:
 .. literalinclude:: ../../examples/providers/singleton_thread_locals.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 11,12
+   :emphasize-lines: 13,15
 
 Implementing scopes
 -------------------
diff --git a/examples/providers/abstract_factory.py b/examples/providers/abstract_factory.py
index 03ccf4f4..f67a66fb 100644
--- a/examples/providers/abstract_factory.py
+++ b/examples/providers/abstract_factory.py
@@ -5,7 +5,7 @@ import dataclasses
 import random
 from typing import List
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class AbstractCacheClient(metaclass=abc.ABCMeta):
@@ -31,18 +31,22 @@ class Service:
     cache: AbstractCacheClient
 
 
-cache_client_factory = providers.AbstractFactory(AbstractCacheClient)
-service_factory = providers.Factory(
-    Service,
-    cache=cache_client_factory,
-)
+class Container(containers.DeclarativeContainer):
+
+    cache_client_factory = providers.AbstractFactory(AbstractCacheClient)
+
+    service_factory = providers.Factory(
+        Service,
+        cache=cache_client_factory,
+    )
 
 
 if __name__ == '__main__':
-    cache_type = random.choice(['redis', 'memcached', None])
+    container = Container()
 
+    cache_type = random.choice(['redis', 'memcached'])
     if cache_type == 'redis':
-        cache_client_factory.override(
+        container.cache_client_factory.override(
             providers.Factory(
                 RedisCacheClient,
                 host='localhost',
@@ -51,7 +55,7 @@ if __name__ == '__main__':
             ),
         )
     elif cache_type == 'memcached':
-        cache_client_factory.override(
+        container.cache_client_factory.override(
             providers.Factory(
                 MemcachedCacheClient,
                 hosts=['10.0.1.1'],
@@ -60,7 +64,7 @@ if __name__ == '__main__':
             ),
         )
 
-    service = service_factory()
+    service = container.service_factory()
     print(service.cache)
     # The output depends on cache_type variable value.
     #
diff --git a/examples/providers/callable.py b/examples/providers/callable.py
index 40e0d363..82d18e38 100644
--- a/examples/providers/callable.py
+++ b/examples/providers/callable.py
@@ -2,17 +2,22 @@
 
 import passlib.hash
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
-password_hasher = providers.Callable(
-    passlib.hash.sha256_crypt.hash,
-    salt_size=16,
-    rounds=10000,
-)
-password_verifier = providers.Callable(passlib.hash.sha256_crypt.verify)
+class Container(containers.DeclarativeContainer):
+
+    password_hasher = providers.Callable(
+        passlib.hash.sha256_crypt.hash,
+        salt_size=16,
+        rounds=10000,
+    )
+
+    password_verifier = providers.Callable(passlib.hash.sha256_crypt.verify)
 
 
 if __name__ == '__main__':
-    hashed_password = password_hasher('super secret')
-    assert password_verifier('super secret', hashed_password)
+    container = Container()
+
+    hashed_password = container.password_hasher('super secret')
+    assert container.password_verifier('super secret', hashed_password)
diff --git a/examples/providers/configuration/configuration.py b/examples/providers/configuration/configuration.py
index a1ea0f44..7a11cbfc 100644
--- a/examples/providers/configuration/configuration.py
+++ b/examples/providers/configuration/configuration.py
@@ -1,21 +1,24 @@
 """`Configuration` provider example."""
 
 import boto3
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
-config = providers.Configuration()
+class Container(containers.DeclarativeContainer):
 
-s3_client_factory = providers.Factory(
-    boto3.client,
-    's3',
-    aws_access_key_id=config.aws.access_key_id,
-    aws_secret_access_key=config.aws.secret_access_key,
-)
+    config = providers.Configuration()
+
+    s3_client_factory = providers.Factory(
+        boto3.client,
+        's3',
+        aws_access_key_id=config.aws.access_key_id,
+        aws_secret_access_key=config.aws.secret_access_key,
+    )
 
 
 if __name__ == '__main__':
-    config.from_dict(
+    container = Container()
+    container.config.from_dict(
         {
             'aws': {
                  'access_key_id': 'KEY',
@@ -23,4 +26,4 @@ if __name__ == '__main__':
              },
         },
     )
-    s3_client = s3_client_factory()
+    s3_client = container.s3_client_factory()
diff --git a/examples/providers/configuration/configuration_dict.py b/examples/providers/configuration/configuration_dict.py
index 275c2b12..d5669ccc 100644
--- a/examples/providers/configuration/configuration_dict.py
+++ b/examples/providers/configuration/configuration_dict.py
@@ -1,20 +1,34 @@
 """`Configuration` provider values loading example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
-config = providers.Configuration()
+class Container(containers.DeclarativeContainer):
 
-config.from_dict(
-    {
+    config = providers.Configuration()
+
+
+if __name__ == '__main__':
+    container = Container()
+
+    container.config.from_dict(
+        {
+            'aws': {
+                 'access_key_id': 'KEY',
+                 'secret_access_key': 'SECRET',
+             },
+        },
+    )
+
+    assert container.config() == {
         'aws': {
-             'access_key_id': 'KEY',
-             'secret_access_key': 'SECRET',
-         },
-    },
-)
-
-assert config() == {'aws': {'access_key_id': 'KEY', 'secret_access_key': 'SECRET'}}
-assert config.aws() == {'access_key_id': 'KEY', 'secret_access_key': 'SECRET'}
-assert config.aws.access_key_id() == 'KEY'
-assert config.aws.secret_access_key() == 'SECRET'
+            'access_key_id': 'KEY',
+            'secret_access_key': 'SECRET',
+        },
+    }
+    assert container.config.aws() == {
+        'access_key_id': 'KEY',
+        'secret_access_key': 'SECRET',
+    }
+    assert container.config.aws.access_key_id() == 'KEY'
+    assert container.config.aws.secret_access_key() == 'SECRET'
diff --git a/examples/providers/configuration/configuration_env.py b/examples/providers/configuration/configuration_env.py
index 52c3e0ca..b9d491bc 100644
--- a/examples/providers/configuration/configuration_env.py
+++ b/examples/providers/configuration/configuration_env.py
@@ -2,20 +2,25 @@
 
 import os
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
-# Emulate environment variables
-os.environ['AWS_ACCESS_KEY_ID'] = 'KEY'
-os.environ['AWS_SECRET_ACCESS_KEY'] = 'SECRET'
+class Container(containers.DeclarativeContainer):
+
+    config = providers.Configuration()
 
 
-config = providers.Configuration()
+if __name__ == '__main__':
+    container = Container()
 
-config.aws.access_key_id.from_env('AWS_ACCESS_KEY_ID')
-config.aws.secret_access_key.from_env('AWS_SECRET_ACCESS_KEY')
-config.optional.from_env('UNDEFINED', 'default_value')
+    # Emulate environment variables
+    os.environ['AWS_ACCESS_KEY_ID'] = 'KEY'
+    os.environ['AWS_SECRET_ACCESS_KEY'] = 'SECRET'
 
-assert config.aws.access_key_id() == 'KEY'
-assert config.aws.secret_access_key() == 'SECRET'
-assert config.optional() == 'default_value'
+    container.config.aws.access_key_id.from_env('AWS_ACCESS_KEY_ID')
+    container.config.aws.secret_access_key.from_env('AWS_SECRET_ACCESS_KEY')
+    container.config.optional.from_env('UNDEFINED', 'default_value')
+
+    assert container.config.aws.access_key_id() == 'KEY'
+    assert container.config.aws.secret_access_key() == 'SECRET'
+    assert container.config.optional() == 'default_value'
diff --git a/examples/providers/configuration/configuration_ini.py b/examples/providers/configuration/configuration_ini.py
index 0533a8ae..98783bd0 100644
--- a/examples/providers/configuration/configuration_ini.py
+++ b/examples/providers/configuration/configuration_ini.py
@@ -1,13 +1,27 @@
 """`Configuration` provider values loading example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
-config = providers.Configuration()
+class Container(containers.DeclarativeContainer):
 
-config.from_ini('examples/providers/configuration/config.ini')
+    config = providers.Configuration()
 
-assert config() == {'aws': {'access_key_id': 'KEY', 'secret_access_key': 'SECRET'}}
-assert config.aws() == {'access_key_id': 'KEY', 'secret_access_key': 'SECRET'}
-assert config.aws.access_key_id() == 'KEY'
-assert config.aws.secret_access_key() == 'SECRET'
+
+if __name__ == '__main__':
+    container = Container()
+
+    container.config.from_ini('examples/providers/configuration/config.ini')
+
+    assert container.config() == {
+        'aws': {
+            'access_key_id': 'KEY',
+            'secret_access_key': 'SECRET',
+        },
+    }
+    assert container.config.aws() == {
+        'access_key_id': 'KEY',
+        'secret_access_key': 'SECRET',
+    }
+    assert container.config.aws.access_key_id() == 'KEY'
+    assert container.config.aws.secret_access_key() == 'SECRET'
diff --git a/examples/providers/configuration/configuration_itemselector.py b/examples/providers/configuration/configuration_itemselector.py
index fd60a616..eb257843 100644
--- a/examples/providers/configuration/configuration_itemselector.py
+++ b/examples/providers/configuration/configuration_itemselector.py
@@ -1,11 +1,8 @@
-"""`Configuration` provider dynamic item selector.
-
-Details: https://github.com/ets-labs/python-dependency-injector/issues/274
-"""
+"""`Configuration` provider dynamic item selector."""
 
 import dataclasses
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 @dataclasses.dataclass
@@ -14,34 +11,37 @@ class Foo:
     option2: object
 
 
-config = providers.Configuration(default={
-    'target': 'A',
-    'items': {
-        'A': {
-            'option1': 60,
-            'option2': 80,
-        },
-        'B': {
-            'option1': 10,
-            'option2': 20,
-        },
-    },
-})
+class Container(containers.DeclarativeContainer):
 
-foo = providers.Factory(
-    Foo,
-    option1=config.items[config.target].option1,
-    option2=config.items[config.target].option2,
-)
+    config = providers.Configuration(default={
+        'target': 'A',
+        'items': {
+            'A': {
+                'option1': 60,
+                'option2': 80,
+            },
+            'B': {
+                'option1': 10,
+                'option2': 20,
+            },
+        },
+    })
+
+    foo_factory = providers.Factory(
+        Foo,
+        option1=config.items[config.target].option1,
+        option2=config.items[config.target].option2,
+    )
 
 
 if __name__ == '__main__':
-    config.target.from_env('TARGET')
-    f = foo()
-    print(f.option1, f.option2)
+    container = Container()
 
+    container.config.target.from_env('TARGET')
+    foo = container.foo_factory()
+    print(foo.option1, foo.option2)
 
-# $ TARGET=A python configuration_itemselector.py
-# 60 80
-# $ TARGET=B python configuration_itemselector.py
-# 10 20
+    # $ TARGET=A python configuration_itemselector.py
+    # 60 80
+    # $ TARGET=B python configuration_itemselector.py
+    # 10 20
diff --git a/examples/providers/configuration/configuration_multiple.py b/examples/providers/configuration/configuration_multiple.py
index 4b85c87b..ac95b3e2 100644
--- a/examples/providers/configuration/configuration_multiple.py
+++ b/examples/providers/configuration/configuration_multiple.py
@@ -1,14 +1,28 @@
 """`Configuration` provider values loading example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
-config = providers.Configuration()
+class Container(containers.DeclarativeContainer):
 
-config.from_yaml('examples/providers/configuration/config.yml')
-config.from_yaml('examples/providers/configuration/config.local.yml')
+    config = providers.Configuration()
 
-assert config() == {'aws': {'access_key_id': 'LOCAL-KEY', 'secret_access_key': 'LOCAL-SECRET'}}
-assert config.aws() == {'access_key_id': 'LOCAL-KEY', 'secret_access_key': 'LOCAL-SECRET'}
-assert config.aws.access_key_id() == 'LOCAL-KEY'
-assert config.aws.secret_access_key() == 'LOCAL-SECRET'
+
+if __name__ == '__main__':
+    container = Container()
+
+    container.config.from_yaml('examples/providers/configuration/config.yml')
+    container.config.from_yaml('examples/providers/configuration/config.local.yml')
+
+    assert container.config() == {
+        'aws': {
+            'access_key_id': 'LOCAL-KEY',
+            'secret_access_key': 'LOCAL-SECRET',
+        },
+    }
+    assert container.config.aws() == {
+        'access_key_id': 'LOCAL-KEY',
+        'secret_access_key': 'LOCAL-SECRET',
+    }
+    assert container.config.aws.access_key_id() == 'LOCAL-KEY'
+    assert container.config.aws.secret_access_key() == 'LOCAL-SECRET'
diff --git a/examples/providers/configuration/configuration_type.py b/examples/providers/configuration/configuration_type.py
index 213f9f79..8c8e044d 100644
--- a/examples/providers/configuration/configuration_type.py
+++ b/examples/providers/configuration/configuration_type.py
@@ -2,7 +2,7 @@
 
 import os
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class ApiClient:
@@ -11,24 +11,28 @@ class ApiClient:
         self.timeout = timeout
 
 
-config = providers.Configuration()
+class Container(containers.DeclarativeContainer):
 
-api_client_factory = providers.Factory(
-    ApiClient,
-    api_key=config.api.key,
-    timeout=config.api.timeout.as_int(),
-)
+    config = providers.Configuration()
+
+    api_client_factory = providers.Factory(
+        ApiClient,
+        api_key=config.api.key,
+        timeout=config.api.timeout.as_int(),
+    )
 
 
 if __name__ == '__main__':
+    container = Container()
+
     # Emulate environment variables
     os.environ['API_KEY'] = 'secret'
     os.environ['API_TIMEOUT'] = '5'
 
-    config.api.key.from_env('API_KEY')
-    config.api.timeout.from_env('API_TIMEOUT')
+    container.config.api.key.from_env('API_KEY')
+    container.config.api.timeout.from_env('API_TIMEOUT')
 
-    api_client = api_client_factory()
+    api_client = container.api_client_factory()
 
     assert api_client.api_key == 'secret'
     assert api_client.timeout == 5
diff --git a/examples/providers/configuration/configuration_type_custom.py b/examples/providers/configuration/configuration_type_custom.py
index 9b53dafe..6782ab52 100644
--- a/examples/providers/configuration/configuration_type_custom.py
+++ b/examples/providers/configuration/configuration_type_custom.py
@@ -3,7 +3,7 @@
 import os
 import decimal
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class Calculator:
@@ -11,20 +11,24 @@ class Calculator:
         self.pi = pi
 
 
-config = providers.Configuration()
+class Container(containers.DeclarativeContainer):
 
-calculator_factory = providers.Factory(
-    Calculator,
-    pi=config.pi.as_(decimal.Decimal),
-)
+    config = providers.Configuration()
+
+    calculator_factory = providers.Factory(
+        Calculator,
+        pi=config.pi.as_(decimal.Decimal),
+    )
 
 
 if __name__ == '__main__':
+    container = Container()
+
     # Emulate environment variables
     os.environ['PI'] = '3.1415926535897932384626433832'
 
-    config.pi.from_env('PI')
+    container.config.pi.from_env('PI')
 
-    calculator = calculator_factory()
+    calculator = container.calculator_factory()
 
     assert calculator.pi == decimal.Decimal('3.1415926535897932384626433832')
diff --git a/examples/providers/configuration/configuration_yaml.py b/examples/providers/configuration/configuration_yaml.py
index 842b4ae8..d281aaf0 100644
--- a/examples/providers/configuration/configuration_yaml.py
+++ b/examples/providers/configuration/configuration_yaml.py
@@ -1,13 +1,27 @@
 """`Configuration` provider values loading example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
-config = providers.Configuration()
+class Container(containers.DeclarativeContainer):
 
-config.from_yaml('examples/providers/configuration/config.yml')
+    config = providers.Configuration()
 
-assert config() == {'aws': {'access_key_id': 'KEY', 'secret_access_key': 'SECRET'}}
-assert config.aws() == {'access_key_id': 'KEY', 'secret_access_key': 'SECRET'}
-assert config.aws.access_key_id() == 'KEY'
-assert config.aws.secret_access_key() == 'SECRET'
+
+if __name__ == '__main__':
+    container = Container()
+
+    container.config.from_yaml('examples/providers/configuration/config.yml')
+
+    assert container.config() == {
+        'aws': {
+            'access_key_id': 'KEY',
+            'secret_access_key': 'SECRET',
+        },
+    }
+    assert container.config.aws() == {
+        'access_key_id': 'KEY',
+        'secret_access_key': 'SECRET',
+    }
+    assert container.config.aws.access_key_id() == 'KEY'
+    assert container.config.aws.secret_access_key() == 'SECRET'
diff --git a/examples/providers/coroutine.py b/examples/providers/coroutine.py
index 98767295..d42689ba 100644
--- a/examples/providers/coroutine.py
+++ b/examples/providers/coroutine.py
@@ -2,7 +2,7 @@
 
 import asyncio
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 async def coroutine(arg1, arg2):
@@ -10,10 +10,14 @@ async def coroutine(arg1, arg2):
     return arg1, arg2
 
 
-coroutine_provider = providers.Coroutine(coroutine, arg1=1, arg2=2)
+class Container(containers.DeclarativeContainer):
+
+    coroutine_provider = providers.Coroutine(coroutine, arg1=1, arg2=2)
 
 
 if __name__ == '__main__':
-    arg1, arg2 = asyncio.run(coroutine_provider())
+    container = Container()
+
+    arg1, arg2 = asyncio.run(container.coroutine_provider())
     assert (arg1, arg2) == (1, 2)
-    assert asyncio.iscoroutinefunction(coroutine_provider)
+    assert asyncio.iscoroutinefunction(container.coroutine_provider)
diff --git a/examples/providers/custom_factory.py b/examples/providers/custom_factory.py
index 706ed04c..c73ab041 100644
--- a/examples/providers/custom_factory.py
+++ b/examples/providers/custom_factory.py
@@ -1,6 +1,6 @@
 """Custom provider example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class CustomFactory(providers.Provider):
@@ -29,14 +29,18 @@ class CustomFactory(providers.Provider):
         return self._factory(*args, **kwargs)
 
 
-factory = CustomFactory(object)
+class Container(containers.DeclarativeContainer):
+
+    factory = CustomFactory(object)
 
 
 if __name__ == '__main__':
-    object1 = factory()
+    container = Container()
+
+    object1 = container.factory()
     assert isinstance(object1, object)
 
-    object2 = factory()
+    object2 = container.factory()
     assert isinstance(object1, object)
 
     assert object1 is not object2
diff --git a/examples/providers/factory.py b/examples/providers/factory.py
index c83ded02..7fa38386 100644
--- a/examples/providers/factory.py
+++ b/examples/providers/factory.py
@@ -1,15 +1,19 @@
 """`Factory` provider example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class User:
     ...
 
 
-users_factory = providers.Factory(User)
+class Container(containers.DeclarativeContainer):
+
+    user_factory = providers.Factory(User)
 
 
 if __name__ == '__main__':
-    user1 = users_factory()
-    user2 = users_factory()
+    container = Container()
+
+    user1 = container.user_factory()
+    user2 = container.user_factory()
diff --git a/examples/providers/factory_aggregate.py b/examples/providers/factory_aggregate.py
index 7facca65..299e17cc 100644
--- a/examples/providers/factory_aggregate.py
+++ b/examples/providers/factory_aggregate.py
@@ -3,7 +3,7 @@
 import dataclasses
 import sys
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 @dataclasses.dataclass
@@ -30,11 +30,13 @@ class Ludo(Game):
     ...
 
 
-game_factory = providers.FactoryAggregate(
-    chess=providers.Factory(Chess),
-    checkers=providers.Factory(Checkers),
-    ludo=providers.Factory(Ludo),
-)
+class Container(containers.DeclarativeContainer):
+
+    game_factory = providers.FactoryAggregate(
+        chess=providers.Factory(Chess),
+        checkers=providers.Factory(Checkers),
+        ludo=providers.Factory(Ludo),
+    )
 
 
 if __name__ == '__main__':
@@ -42,7 +44,9 @@ if __name__ == '__main__':
     player1 = sys.argv[2].capitalize()
     player2 = sys.argv[3].capitalize()
 
-    selected_game = game_factory(game_type, player1, player2)
+    container = Container()
+
+    selected_game = container.game_factory(game_type, player1, player2)
     selected_game.play()
 
     # $ python factory_aggregate.py chess John Jane
diff --git a/examples/providers/factory_delegation.py b/examples/providers/factory_delegation.py
index 00f3fec5..7112ab3a 100644
--- a/examples/providers/factory_delegation.py
+++ b/examples/providers/factory_delegation.py
@@ -2,7 +2,7 @@
 
 from typing import Callable, List
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class User:
@@ -21,15 +21,20 @@ class UserRepository:
         ]
 
 
-user_factory = providers.Factory(User)
-user_repository_factory = providers.Factory(
-    UserRepository,
-    user_factory=user_factory.provider,
-)
+class Container(containers.DeclarativeContainer):
+
+    user_factory = providers.Factory(User)
+
+    user_repository_factory = providers.Factory(
+        UserRepository,
+        user_factory=user_factory.provider,
+    )
 
 
 if __name__ == '__main__':
-    user_repository = user_repository_factory()
+    container = Container()
+
+    user_repository = container.user_repository_factory()
 
     user1, user2 = user_repository.get_all()
 
diff --git a/examples/providers/factory_init_injections.py b/examples/providers/factory_init_injections.py
index d720edb6..134d5b16 100644
--- a/examples/providers/factory_init_injections.py
+++ b/examples/providers/factory_init_injections.py
@@ -1,6 +1,6 @@
 """`Factory` provider init injections example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class Photo:
@@ -13,23 +13,27 @@ class User:
         self.main_photo = main_photo
 
 
-photo_factory = providers.Factory(Photo)
-user_factory = providers.Factory(
-    User,
-    main_photo=photo_factory,
-)
+class Container(containers.DeclarativeContainer):
+
+    photo_factory = providers.Factory(Photo)
+
+    user_factory = providers.Factory(
+        User,
+        main_photo=photo_factory,
+    )
 
 
 if __name__ == '__main__':
-    user1 = user_factory(1)
+    container = Container()
+
+    user1 = container.user_factory(1)
     # Same as: # user1 = User(1, main_photo=Photo())
 
-    user2 = user_factory(2)
+    user2 = container.user_factory(2)
     # Same as: # user2 = User(2, main_photo=Photo())
 
-    # Context keyword arguments have a priority:
     another_photo = Photo()
-    user3 = user_factory(
+    user3 = container.user_factory(
         uid=3,
         main_photo=another_photo,
     )
diff --git a/examples/providers/factory_init_injections_underlying.py b/examples/providers/factory_init_injections_underlying.py
index 5c9f196f..cc291a6a 100644
--- a/examples/providers/factory_init_injections_underlying.py
+++ b/examples/providers/factory_init_injections_underlying.py
@@ -1,6 +1,6 @@
 """`Factory` provider - passing injections to the underlying providers example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class Regularizer:
@@ -23,26 +23,31 @@ class Algorithm:
         self.task = task
 
 
-algorithm_factory = providers.Factory(
-    Algorithm,
-    task=providers.Factory(
-        ClassificationTask,
-        loss=providers.Factory(
-            Loss,
-            regularizer=providers.Factory(
-                Regularizer,
+class Container(containers.DeclarativeContainer):
+
+    algorithm_factory = providers.Factory(
+        Algorithm,
+        task=providers.Factory(
+            ClassificationTask,
+            loss=providers.Factory(
+                Loss,
+                regularizer=providers.Factory(
+                    Regularizer,
+                ),
             ),
         ),
-    ),
-)
+    )
 
 
 if __name__ == '__main__':
-    algorithm_1 = algorithm_factory(task__loss__regularizer__alpha=0.5)
+    container = Container()
+
+    algorithm_1 = container.algorithm_factory(
+        task__loss__regularizer__alpha=0.5,
+    )
     assert algorithm_1.task.loss.regularizer.alpha == 0.5
 
-    algorithm_2 = algorithm_factory(task__loss__regularizer__alpha=0.7)
+    algorithm_2 = container.algorithm_factory(
+        task__loss__regularizer__alpha=0.7,
+    )
     assert algorithm_2.task.loss.regularizer.alpha == 0.7
-
-    algorithm_3 = algorithm_factory(task__loss__regularizer=Regularizer(alpha=0.8))
-    assert algorithm_3.task.loss.regularizer.alpha == 0.8
diff --git a/examples/providers/factory_provided_type.py b/examples/providers/factory_provided_type.py
index 7e37cfa5..bcf80b71 100644
--- a/examples/providers/factory_provided_type.py
+++ b/examples/providers/factory_provided_type.py
@@ -1,6 +1,6 @@
 """`Factory` specialization with limitation to provided type example."""
 
-from dependency_injector import providers, errors
+from dependency_injector import containers, providers, errors
 
 
 class BaseService:
@@ -17,11 +17,15 @@ class ServiceProvider(providers.Factory):
 
 
 # Creating service provider with a correct provided type:
-some_service_provider = ServiceProvider(SomeService)
+class Services(containers.DeclarativeContainer):
+
+    some_service_provider = ServiceProvider(SomeService)
+
 
 # Trying to create service provider an incorrect provided type:
 try:
-    some_service_provider = ServiceProvider(object)
+    class Container(containers.DeclarativeContainer):
+        some_service_provider = ServiceProvider(object)
 except errors.Error as exception:
     print(exception)
     # The output is:
diff --git a/examples/providers/list.py b/examples/providers/list.py
index 1d2eb474..d7096e62 100644
--- a/examples/providers/list.py
+++ b/examples/providers/list.py
@@ -3,7 +3,7 @@
 import dataclasses
 from typing import List
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 @dataclasses.dataclass
@@ -16,23 +16,27 @@ class Dispatcher:
     modules: List[Module]
 
 
-dispatcher_factory = providers.Factory(
-    Dispatcher,
-    modules=providers.List(
-        providers.Factory(Module, name='m1'),
-        providers.Factory(Module, name='m2'),
-    ),
-)
+class Container(containers.DeclarativeContainer):
+
+    dispatcher_factory = providers.Factory(
+        Dispatcher,
+        modules=providers.List(
+            providers.Factory(Module, name='m1'),
+            providers.Factory(Module, name='m2'),
+        ),
+    )
 
 
 if __name__ == '__main__':
-    dispatcher = dispatcher_factory()
+    container = Container()
+
+    dispatcher = container.dispatcher_factory()
 
     assert isinstance(dispatcher.modules, list)
     assert dispatcher.modules[0].name == 'm1'
     assert dispatcher.modules[1].name == 'm2'
 
-    # Call "dispatcher = dispatcher_factory()" is an equivalent for:
+    # Call "dispatcher = container.dispatcher_factory()" is equivalent to:
     # dispatcher = Dispatcher(
     #     modules=[
     #         Module(name='m1'),
diff --git a/examples/providers/object.py b/examples/providers/object.py
index 7da9cb26..d0066153 100644
--- a/examples/providers/object.py
+++ b/examples/providers/object.py
@@ -1,10 +1,14 @@
 """`Object` provider example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
-object_provider = providers.Object(1)
+class Container(containers.DeclarativeContainer):
+
+    object_provider = providers.Object(1)
 
 
 if __name__ == '__main__':
-    assert object_provider() == 1
+    container = Container()
+
+    assert container.object_provider() == 1
diff --git a/examples/providers/overriding.py b/examples/providers/overriding.py
index 42c01de5..9627667c 100644
--- a/examples/providers/overriding.py
+++ b/examples/providers/overriding.py
@@ -1,8 +1,9 @@
 """Simple providers overriding example."""
 
+import dataclasses
 import unittest.mock
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class ApiClient:
@@ -13,30 +14,35 @@ class ApiClientStub(ApiClient):
     ...
 
 
+@dataclasses.dataclass
 class Service:
-    def __init__(self, api_client: ApiClient):
-        self._api_client = api_client
+    api_client: ApiClient
 
 
-api_client_factory = providers.Factory(ApiClient)
-service_factory = providers.Factory(
-    Service,
-    api_client=api_client_factory,
-)
+class Container(containers.DeclarativeContainer):
+
+    api_client_factory = providers.Factory(ApiClient)
+
+    service_factory = providers.Factory(
+        Service,
+        api_client=api_client_factory,
+    )
 
 
 if __name__ == '__main__':
+    container = Container()
+
     # 1. Use .override() to replace the API client with stub
-    api_client_factory.override(providers.Factory(ApiClientStub))
-    service1 = service_factory()
+    container.api_client_factory.override(providers.Factory(ApiClientStub))
+    service1 = container.service_factory()
     assert isinstance(service1.api_client, ApiClientStub)
 
     # 2. Use .override() as a context manager to mock the API client in testing
-    with api_client_factory.override(unittest.mock.Mock(ApiClient)):
-        service3 = service_factory()
-        assert isinstance(service3.api_client, unittest.mock.Mock)
+    with container.api_client_factory.override(unittest.mock.Mock(ApiClient)):
+        service2 = container.service_factory()
+        assert isinstance(service2.api_client, unittest.mock.Mock)
 
     # 3. Use .reset_override() to get back to normal
-    api_client_factory.reset_override()
-    service3 = service_factory()
+    container.api_client_factory.reset_override()
+    service3 = container.service_factory()
     assert isinstance(service3.api_client, ApiClient)
diff --git a/examples/providers/provided_instance.py b/examples/providers/provided_instance.py
index e61f9bb7..bf63bc6f 100644
--- a/examples/providers/provided_instance.py
+++ b/examples/providers/provided_instance.py
@@ -1,6 +1,6 @@
 """Example of the injecting of provided instance attributes and items."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class Service:
@@ -23,17 +23,21 @@ class Client:
         self.value4 = value4
 
 
-service = providers.Singleton(Service)
+class Container(containers.DeclarativeContainer):
 
-client_factory = providers.Factory(
-    Client,
-    value1=service.provided[0],
-    value2=service.provided.value,
-    value3=service.provided.values[0],
-    value4=service.provided.get_value.call(),
-)
+    service = providers.Singleton(Service)
+
+    client_factory = providers.Factory(
+        Client,
+        value1=service.provided[0],
+        value2=service.provided.value,
+        value3=service.provided.values[0],
+        value4=service.provided.get_value.call(),
+    )
 
 
 if __name__ == '__main__':
-    client = client_factory()
+    container = Container()
+
+    client = container.client_factory()
     assert client.value1 == client.value2 == client.value3 == 'foo'
diff --git a/examples/providers/provided_instance_complex.py b/examples/providers/provided_instance_complex.py
index 20381f9b..108e1ebf 100644
--- a/examples/providers/provided_instance_complex.py
+++ b/examples/providers/provided_instance_complex.py
@@ -1,6 +1,6 @@
 """Complex example of the injecting of provided instance attributes and items."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class Service:
@@ -12,31 +12,35 @@ class Service:
         return self.value
 
 
-service = providers.Singleton(Service, value=42)
+class Container(containers.DeclarativeContainer):
 
-dependency = providers.Object(
-    {
-        'foo': {
-            'bar': 10,
-            'baz': lambda arg: {'arg': arg}
+    service = providers.Singleton(Service, value=42)
+
+    dependency = providers.Object(
+        {
+            'foo': {
+                'bar': 10,
+                'baz': lambda arg: {'arg': arg}
+            },
         },
-    },
-)
+    )
 
-demo_list = providers.List(
-    dependency.provided['foo']['bar'],
-    dependency.provided['foo']['baz'].call(22)['arg'],
-    dependency.provided['foo']['baz'].call(service)['arg'],
-    dependency.provided['foo']['baz'].call(service)['arg'].value,
-    dependency.provided['foo']['baz'].call(service)['arg'].get_value.call(),
-)
+    demo_list = providers.List(
+        dependency.provided['foo']['bar'],
+        dependency.provided['foo']['baz'].call(22)['arg'],
+        dependency.provided['foo']['baz'].call(service)['arg'],
+        dependency.provided['foo']['baz'].call(service)['arg'].value,
+        dependency.provided['foo']['baz'].call(service)['arg'].get_value.call(),
+    )
 
 
 if __name__ == '__main__':
-    assert demo_list() == [
+    container = Container()
+
+    assert container.demo_list() == [
         10,
         22,
-        service(),
+        container.service(),
         42,
         42,
     ]
diff --git a/examples/providers/selector.py b/examples/providers/selector.py
index 7c7c17cd..88166ec4 100644
--- a/examples/providers/selector.py
+++ b/examples/providers/selector.py
@@ -1,6 +1,6 @@
 """`Selector` provider example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class SomeClass:
@@ -11,19 +11,24 @@ class SomeOtherClass:
     ...
 
 
-config = providers.Configuration()
+class Container(containers.DeclarativeContainer):
+
+    config = providers.Configuration()
+
+    selector = providers.Selector(
+        config.one_or_another,
+        one=providers.Factory(SomeClass),
+        another=providers.Factory(SomeOtherClass),
+    )
 
-selector = providers.Selector(
-    config.one_or_another,
-    one=providers.Factory(SomeClass),
-    another=providers.Factory(SomeOtherClass),
-)
 
 if __name__ == '__main__':
-    config.override({'one_or_another': 'one'})
-    instance_1 = selector()
+    container = Container()
+
+    container.config.override({'one_or_another': 'one'})
+    instance_1 = container.selector()
     assert isinstance(instance_1, SomeClass)
 
-    config.override({'one_or_another': 'another'})
-    instance_2 = selector()
+    container.config.override({'one_or_another': 'another'})
+    instance_2 = container.selector()
     assert isinstance(instance_2, SomeOtherClass)
diff --git a/examples/providers/singleton.py b/examples/providers/singleton.py
index 9e94b76c..f1083895 100644
--- a/examples/providers/singleton.py
+++ b/examples/providers/singleton.py
@@ -1,16 +1,20 @@
 """`Singleton` provider example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class UserService:
     ...
 
 
-user_service_provider = providers.Singleton(UserService)
+class Container(containers.DeclarativeContainer):
+
+    user_service_provider = providers.Singleton(UserService)
 
 
 if __name__ == '__main__':
-    user_service1 = user_service_provider()
-    user_service2 = user_service_provider()
+    container = Container()
+
+    user_service1 = container.user_service_provider()
+    user_service2 = container.user_service_provider()
     assert user_service1 is user_service2
diff --git a/examples/providers/singleton_multiple_containers.py b/examples/providers/singleton_multiple_containers.py
new file mode 100644
index 00000000..7b5e4fab
--- /dev/null
+++ b/examples/providers/singleton_multiple_containers.py
@@ -0,0 +1,24 @@
+"""`Singleton` provider resetting example."""
+
+from dependency_injector import containers, providers
+
+
+class UserService:
+    ...
+
+
+class Container(containers.DeclarativeContainer):
+
+    user_service_provider = providers.Singleton(UserService)
+
+
+if __name__ == '__main__':
+    container1 = Container()
+    user_service1 = container1.user_service_provider()
+    assert user_service1 is container1.user_service_provider()
+
+    container2 = Container()
+    user_service2 = container2.user_service_provider()
+    assert user_service2 is container2.user_service_provider()
+
+    assert user_service1 is not user_service2
diff --git a/examples/providers/singleton_resetting.py b/examples/providers/singleton_resetting.py
index edec0594..48e3cadf 100644
--- a/examples/providers/singleton_resetting.py
+++ b/examples/providers/singleton_resetting.py
@@ -1,19 +1,23 @@
 """`Singleton` provider resetting example."""
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 class UserService:
     ...
 
 
-user_service_provider = providers.Singleton(UserService)
+class Container(containers.DeclarativeContainer):
+
+    user_service_provider = providers.Singleton(UserService)
 
 
 if __name__ == '__main__':
-    user_service1 = user_service_provider()
+    container = Container()
 
-    user_service_provider.reset()
+    user_service1 = container.user_service_provider()
 
-    users_service2 = user_service_provider()
-    assert users_service2 is not user_service1
+    container.user_service_provider.reset()
+
+    user_service2 = container.user_service_provider()
+    assert user_service2 is not user_service1
diff --git a/examples/providers/singleton_scoped.py b/examples/providers/singleton_scoped.py
index e9bc2ea6..0d40a6e7 100644
--- a/examples/providers/singleton_scoped.py
+++ b/examples/providers/singleton_scoped.py
@@ -1,30 +1,35 @@
 """`Singleton` - Flask request scope example."""
 
-from dependency_injector import providers
-from flask import Flask
+from dependency_injector import containers, providers
+from flask import Flask, current_app
 
 
 class Service:
     ...
 
 
-service_provider = providers.Singleton(Service)
+class Container(containers.DeclarativeContainer):
+
+    service_provider = providers.Singleton(Service)
 
 
 def index_view():
-    service_1 = service_provider()
-    service_2 = service_provider()
+    service_1 = current_app.container.service_provider()
+    service_2 = current_app.container.service_provider()
     assert service_1 is service_2
     print(service_1)
     return 'Hello  World!'
 
 
 def teardown_context(request):
-    service_provider.reset()
+    current_app.container.service_provider.reset()
     return request
 
 
+container = Container()
+
 app = Flask(__name__)
+app.container = container
 app.add_url_rule('/', 'index', view_func=index_view)
 app.after_request(teardown_context)
 
diff --git a/examples/providers/singleton_thread_locals.py b/examples/providers/singleton_thread_locals.py
index 83325559..1255d718 100644
--- a/examples/providers/singleton_thread_locals.py
+++ b/examples/providers/singleton_thread_locals.py
@@ -3,31 +3,39 @@
 import threading
 import queue
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 def put_in_queue(example_object, queue_object):
     queue_object.put(example_object)
 
 
-thread_local_object = providers.ThreadLocalSingleton(object)
-queue_provider = providers.ThreadSafeSingleton(queue.Queue)
-put_in_queue = providers.Callable(
-    put_in_queue,
-    example_object=thread_local_object,
-    queue_object=queue_provider,
-)
-thread_factory = providers.Factory(
-    threading.Thread,
-    target=put_in_queue.provider,
-)
+class Container(containers.DeclarativeContainer):
+
+    thread_local_object = providers.ThreadLocalSingleton(object)
+
+    queue_provider = providers.ThreadSafeSingleton(queue.Queue)
+
+    put_in_queue = providers.Callable(
+        put_in_queue,
+        example_object=thread_local_object,
+        queue_object=queue_provider,
+    )
+
+    thread_factory = providers.Factory(
+        threading.Thread,
+        target=put_in_queue.provider,
+    )
 
 
 if __name__ == '__main__':
+    container = Container()
+
+    n = 10
     threads = []
-    for thread_number in range(10):
+    for thread_number in range(n):
         threads.append(
-            thread_factory(name='Thread{0}'.format(thread_number)),
+            container.thread_factory(name='Thread{0}'.format(thread_number)),
         )
     for thread in threads:
         thread.start()
@@ -35,9 +43,9 @@ if __name__ == '__main__':
         thread.join()
 
     all_objects = set()
-    while not queue_provider().empty():
-        all_objects.add(queue_provider().get())
+    while not container.queue_provider().empty():
+        all_objects.add(container.queue_provider().get())
 
-    assert len(all_objects) == len(threads)
+    assert len(all_objects) == len(threads) == n
     # Queue contains same number of objects as number of threads where
     # thread-local singleton provider was used.
diff --git a/src/dependency_injector/__init__.py b/src/dependency_injector/__init__.py
index b1aa8bb1..177dd55b 100644
--- a/src/dependency_injector/__init__.py
+++ b/src/dependency_injector/__init__.py
@@ -1,6 +1,6 @@
 """Dependency injector top-level package."""
 
-__version__ = '3.36.0'
+__version__ = '3.37.0'
 """Version number that follows semantic versioning.
 
 :type: str
diff --git a/src/dependency_injector/providers.pyi b/src/dependency_injector/providers.pyi
index c8d97a70..53052c76 100644
--- a/src/dependency_injector/providers.pyi
+++ b/src/dependency_injector/providers.pyi
@@ -283,8 +283,8 @@ class Selector(Provider):
 
 
 class ProvidedInstanceFluentInterface:
-    def __getattr__(self, item: str) -> AttributeGetter: ...
-    def __getitem__(self, item: str) -> ItemGetter: ...
+    def __getattr__(self, item: Any) -> AttributeGetter: ...
+    def __getitem__(self, item: Any) -> ItemGetter: ...
     def call(self, *args: Injection, **kwargs: Injection) -> MethodCaller: ...