diff --git a/.appveyor.yml b/.appveyor.yml
index c97248652..d4cab45cd 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -55,7 +55,13 @@ install:
 
 build_script:
   # Build the compiled extension
-  - "%CMD_IN_ENV% python build.py pip"
+  - "%CMD_IN_ENV% python setup.py build_ext --inplace"
+  - ps: appveyor\download.ps1 
+  - "tar -xzf corpora/en/wordnet.tar.gz"
+  - "%CMD_IN_ENV% python bin/init_model.py en lang_data/ corpora/ data"
+  - "cp package.json data"
+  - "%CMD_IN_ENV% sputnik build data en_default.sputnik"
+  - "%CMD_IN_ENV% sputnik install en_default.sputnik"
 
 test_script:
   # Run the project tests
diff --git a/.travis.yml b/.travis.yml
index 73cbef5cb..b6c2a430e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,8 +17,21 @@ env:
   - PIP_DATE=2015-10-01 MODE=setup-develop
 
 install:
-  - pip install --disable-pip-version-check -U pip
-  - python build.py prepare $PIP_DATE
+  - "pip install --upgrade setuptools"
+  - "pip install cython fabric fabtools"
+  - "pip install -r requirements.txt"
+  - "python setup.py build_ext --inplace"
+  - "mkdir -p corpora/en"
+  - "cd corpora/en"
+  - "wget --no-check-certificate http://wordnetcode.princeton.edu/3.0/WordNet-3.0.tar.gz"
+  - "tar -xzf WordNet-3.0.tar.gz"
+  - "mv WordNet-3.0 wordnet"
+  - "cd ../../"
+  - "export PYTHONPATH=`pwd`"
+  - "python bin/init_model.py en lang_data/ corpora/ data"
+  - "cp package.json data"
+  - "sputnik build data en_default.sputnik"
+  - "sputnik install en_default.sputnik"
 
 script:
   - python build.py $MODE;
diff --git a/package.json b/package.json
new file mode 100644
index 000000000..0710031ed
--- /dev/null
+++ b/package.json
@@ -0,0 +1,17 @@
+{
+    "name": "en_default",
+    "version": "0.100.0",
+    "description": "english default model",
+    "license": "public domain",
+    "include": [
+        "deps/*",
+        "ner/*",
+        "pos/*",
+        "tokenizer/*",
+        "vocab/*",
+        "wordnet/*"
+    ],
+    "compatibility": {
+        "spacy": "==0.100.0"
+    }
+}
diff --git a/requirements.txt b/requirements.txt
index 3418f70d4..979611397 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,4 +10,4 @@ plac
 six
 ujson
 cloudpickle
-sputnik == 0.6.2
+sputnik == 0.6.3
diff --git a/spacy/de/__init__.py b/spacy/de/__init__.py
index 262fbe289..d7cc3dc65 100644
--- a/spacy/de/__init__.py
+++ b/spacy/de/__init__.py
@@ -6,6 +6,4 @@ from ..language import Language
 
 
 class German(Language):
-    @classmethod
-    def default_data_dir(cls):
-        return path.join(path.dirname(__file__), 'data')
+    pass
diff --git a/spacy/en/__init__.py b/spacy/en/__init__.py
index 4d057db20..17af520df 100644
--- a/spacy/en/__init__.py
+++ b/spacy/en/__init__.py
@@ -4,8 +4,6 @@ from os import path
 
 from ..language import Language
 
-LOCAL_DATA_DIR = path.join(path.dirname(__file__), 'data')
-
 
 # improved list from Stone, Denis, Kwantes (2010)
 STOPWORDS = """
@@ -35,9 +33,9 @@ your yours yourself yourselves
 STOPWORDS = set(w for w in STOPWORDS.split() if w)
 
 class English(Language):
-    @classmethod
-    def default_data_dir(cls):
-        return LOCAL_DATA_DIR
+    def __init__(self, **kwargs):
+        kwargs['lang'] = 'en'
+        super(English, self).__init__(**kwargs)
 
     @staticmethod
     def is_stop(string):
diff --git a/spacy/en/download.py b/spacy/en/download.py
index ea459b1b0..ea28e77b9 100644
--- a/spacy/en/download.py
+++ b/spacy/en/download.py
@@ -8,8 +8,11 @@ from sputnik import Sputnik
 
 def migrate(path):
     data_path = os.path.join(path, 'data')
-    if os.path.isdir(data_path) and not os.path.islink(data_path):
-        shutil.rmtree(data_path)
+    if os.path.isdir(data_path):
+        if os.path.islink(data_path):
+            os.unlink(data_path)
+        else:
+            shutil.rmtree(data_path)
     for filename in os.listdir(path):
         if filename.endswith('.tgz'):
             os.unlink(os.path.join(path, filename))
@@ -53,9 +56,6 @@ def main(data_size='all', force=False):
     # FIXME clean up old-style packages
     migrate(path)
 
-    # FIXME supply spacy with an old-style data dir
-    link(package, os.path.join(path, 'data'))
-
 
 if __name__ == '__main__':
     plac.call(main)
diff --git a/spacy/fi/__init__.py b/spacy/fi/__init__.py
index 8e7173767..adba064a5 100644
--- a/spacy/fi/__init__.py
+++ b/spacy/fi/__init__.py
@@ -6,6 +6,4 @@ from ..language import Language
 
 
 class Finnish(Language):
-    @classmethod
-    def default_data_dir(cls):
-        return path.join(path.dirname(__file__), 'data')
+    pass
diff --git a/spacy/it/__init__.py b/spacy/it/__init__.py
index a494de41f..6a824fe82 100644
--- a/spacy/it/__init__.py
+++ b/spacy/it/__init__.py
@@ -6,6 +6,4 @@ from ..language import Language
 
 
 class Italian(Language):
-    @classmethod
-    def default_data_dir(cls):
-        return path.join(path.dirname(__file__), 'data')
+    pass
diff --git a/spacy/language.py b/spacy/language.py
index f598518e2..2ea5eb162 100644
--- a/spacy/language.py
+++ b/spacy/language.py
@@ -20,6 +20,7 @@ from .syntax.ner import BiluoPushDown
 from .syntax.arc_eager import ArcEager
 
 from .attrs import TAG, DEP, ENT_IOB, ENT_TYPE, HEAD
+from .util import get_package
 
 
 class Language(object):
@@ -100,7 +101,7 @@ class Language(object):
         return 0
 
     @classmethod
-    def default_lex_attrs(cls, data_dir=None):
+    def default_lex_attrs(cls):
         return {
             attrs.LOWER: cls.lower,
             attrs.NORM: cls.norm,
@@ -134,79 +135,96 @@ class Language(object):
         return {0: {'PER': True, 'LOC': True, 'ORG': True, 'MISC': True}}
 
     @classmethod
-    def default_data_dir(cls):
-        return path.join(path.dirname(__file__), 'data')
-
-    @classmethod
-    def default_vocab(cls, data_dir=None, get_lex_attr=None):
-        if data_dir is None:
-            data_dir = cls.default_data_dir()
+    def default_vocab(cls, package=None, get_lex_attr=None):
+        if package is None:
+            package = get_package()
         if get_lex_attr is None:
-            get_lex_attr = cls.default_lex_attrs(data_dir)
-        return Vocab.from_dir(
-                path.join(data_dir, 'vocab'),
-                get_lex_attr=get_lex_attr)
+            get_lex_attr = cls.default_lex_attrs()
+        return Vocab.from_package(package, get_lex_attr=get_lex_attr)
 
     @classmethod
-    def default_tokenizer(cls, vocab, data_dir):
-        if path.exists(data_dir):
-            return Tokenizer.from_dir(vocab, data_dir)
-        else:
-            return Tokenizer(vocab, {}, None, None, None)
-
-    @classmethod
-    def default_tagger(cls, vocab, data_dir):
-        if path.exists(data_dir):
-            return Tagger.from_dir(data_dir, vocab)
-        else:
-            return None
-
-    @classmethod
-    def default_parser(cls, vocab, data_dir):
-        if path.exists(data_dir):
+    def default_parser(cls, package, vocab):
+        data_dir = package.dir_path('deps', require=False)
+        if data_dir and path.exists(data_dir):
             return Parser.from_dir(data_dir, vocab.strings, ArcEager)
-        else:
-            return None
 
     @classmethod
-    def default_entity(cls, vocab, data_dir):
-        if path.exists(data_dir):
+    def default_entity(cls, package, vocab):
+        data_dir = package.dir_path('ner', require=False)
+        if data_dir and path.exists(data_dir):
             return Parser.from_dir(data_dir, vocab.strings, BiluoPushDown)
-        else:
-            return None
 
-    @classmethod
-    def default_matcher(cls, vocab, data_dir):
-        if path.exists(data_dir):
-            return Matcher.from_dir(data_dir, vocab)
-        else:
-            return None
+    def __init__(self, **kwargs):
+        """
+           a model can be specified:
+
+           1) by a path to the model directory (DEPRECATED)
+             - Language(data_dir='path/to/data')
+
+           2) by a language identifier (and optionally a package root dir)
+             - Language(lang='en')
+             - Language(lang='en', data_dir='spacy/data')
+
+           3) by a model name/version (and optionally a package root dir)
+             - Language(model='en_default')
+             - Language(model='en_default ==1.0.0')
+             - Language(model='en_default <1.1.0, data_dir='spacy/data')
+        """
+
+        data_dir = kwargs.pop('data_dir', None)
+
+        lang = kwargs.pop('lang', None)
+        model = kwargs.pop('model', None)
+
+        vocab = kwargs.pop('vocab', None)
+        tokenizer = kwargs.pop('tokenizer', None)
+        tagger = kwargs.pop('tagger', None)
+        parser = kwargs.pop('parser', None)
+        entity = kwargs.pop('entity', None)
+        matcher = kwargs.pop('matcher', None)
+        serializer = kwargs.pop('serializer', None)
+
+        load_vectors = kwargs.pop('load_vectors', True)
+
+        # support non-package data dirs
+        if data_dir and path.exists(path.join(data_dir, 'vocab')):
+            class Package(object):
+                def __init__(self, root):
+                    self.root = root
+
+                def has_file(self, *path_parts):
+                    return path.exists(path.join(self.root, *path_parts))
+
+                def file_path(self, *path_parts, **kwargs):
+                    return path.join(self.root, *path_parts)
+
+                def dir_path(self, *path_parts, **kwargs):
+                    return path.join(self.root, *path_parts)
+
+                def load_utf8(self, func, *path_parts, **kwargs):
+                    with io.open(self.file_path(path.join(*path_parts)),
+                                 mode='r', encoding='utf8') as f:
+                        return func(f)
+
+            warn("using non-package data_dir", DeprecationWarning)
+            package = Package(data_dir)
+        else:
+            package = get_package(name=model, data_path=data_dir)
 
-    def __init__(self, data_dir=None, vocab=None, tokenizer=None, tagger=None,
-                 parser=None, entity=None, matcher=None, serializer=None,
-                 load_vectors=True):
         if load_vectors is not True:
             warn("load_vectors is deprecated", DeprecationWarning)
-        if data_dir in (None, True):
-            data_dir = self.default_data_dir()
         if vocab in (None, True):
-            vocab = self.default_vocab(data_dir)
+            self.vocab = self.default_vocab(package)
         if tokenizer in (None, True):
-            tokenizer = self.default_tokenizer(vocab, data_dir=path.join(data_dir, 'tokenizer'))
+            self.tokenizer = Tokenizer.from_package(package, self.vocab)
         if tagger in (None, True):
-            tagger = self.default_tagger(vocab, data_dir=path.join(data_dir, 'pos'))
+            self.tagger = Tagger.from_package(package, self.vocab)
         if entity in (None, True):
-            entity = self.default_entity(vocab, data_dir=path.join(data_dir, 'ner'))
+            self.entity = self.default_entity(package, self.vocab)
         if parser in (None, True):
-            parser = self.default_parser(vocab, data_dir=path.join(data_dir, 'deps'))
+            self.parser = self.default_parser(package, self.vocab)
         if matcher in (None, True):
-            matcher = self.default_matcher(vocab, data_dir=data_dir)
-        self.vocab = vocab
-        self.tokenizer = tokenizer
-        self.tagger = tagger
-        self.parser = parser
-        self.entity = entity
-        self.matcher = matcher
+            self.matcher = Matcher.from_package(package, self.vocab)
 
     def __reduce__(self):
         return (self.__class__,
diff --git a/spacy/lemmatizer.py b/spacy/lemmatizer.py
index 08e511f68..c5b9c1c50 100644
--- a/spacy/lemmatizer.py
+++ b/spacy/lemmatizer.py
@@ -12,16 +12,21 @@ from .parts_of_speech import NOUN, VERB, ADJ, PUNCT
 
 class Lemmatizer(object):
     @classmethod
-    def from_dir(cls, data_dir):
+    def from_package(cls, package):
         index = {}
         exc = {}
         for pos in ['adj', 'noun', 'verb']:
-            index[pos] = read_index(path.join(data_dir, 'wordnet', 'index.%s' % pos))
-            exc[pos] = read_exc(path.join(data_dir, 'wordnet', '%s.exc' % pos))
-        if path.exists(path.join(data_dir, 'vocab', 'lemma_rules.json')):
-            rules = json.load(codecs.open(path.join(data_dir, 'vocab', 'lemma_rules.json'), encoding='utf_8'))
-        else:
-            rules = {}
+            index[pos] = package.load_utf8(read_index,
+                'wordnet', 'index.%s' % pos,
+                default=set())  # TODO: really optional?
+            exc[pos] = package.load_utf8(read_exc,
+                'wordnet', '%s.exc' % pos,
+                default={})  # TODO: really optional?
+
+        rules = package.load_utf8(json.load,
+            'vocab', 'lemma_rules.json',
+            default={})  # TODO: really optional?
+
         return cls(index, exc, rules)
 
     def __init__(self, index, exceptions, rules):
@@ -70,11 +75,9 @@ def lemmatize(string, index, exceptions, rules):
     return set(forms)
 
 
-def read_index(loc):
+def read_index(fileobj):
     index = set()
-    if not path.exists(loc):
-        return index
-    for line in codecs.open(loc, 'r', 'utf8'):
+    for line in fileobj:
         if line.startswith(' '):
             continue
         pieces = line.split()
@@ -84,11 +87,9 @@ def read_index(loc):
     return index
 
 
-def read_exc(loc):
+def read_exc(fileobj):
     exceptions = {}
-    if not path.exists(loc):
-        return exceptions
-    for line in codecs.open(loc, 'r', 'utf8'):
+    for line in fileobj:
         if line.startswith(' '):
             continue
         pieces = line.split()
diff --git a/spacy/matcher.pyx b/spacy/matcher.pyx
index 1fa91fab1..4d36b7742 100644
--- a/spacy/matcher.pyx
+++ b/spacy/matcher.pyx
@@ -169,14 +169,11 @@ cdef class Matcher:
     cdef object _patterns
 
     @classmethod
-    def from_dir(cls, data_dir, Vocab vocab):
-        patterns_loc = path.join(data_dir, 'vocab', 'gazetteer.json')
-        if path.exists(patterns_loc):
-            patterns_data = open(patterns_loc).read()
-            patterns = json.loads(patterns_data)
-            return cls(vocab, patterns)
-        else:
-            return cls(vocab, {})
+    def from_package(cls, package, Vocab vocab):
+        patterns = package.load_utf8(json.load,
+            'vocab', 'gazetteer.json',
+            default={})  # TODO: really optional?
+        return cls(vocab, patterns)
 
     def __init__(self, vocab, patterns):
         self.vocab = vocab
diff --git a/spacy/tagger.pyx b/spacy/tagger.pyx
index 421d97357..2c05b4a84 100644
--- a/spacy/tagger.pyx
+++ b/spacy/tagger.pyx
@@ -146,15 +146,19 @@ cdef class Tagger:
         return cls(vocab, model)
 
     @classmethod
-    def from_dir(cls, data_dir, vocab):
-        if path.exists(path.join(data_dir, 'templates.json')):
-            templates = json.loads(open(path.join(data_dir, 'templates.json')))
-        else:
-            templates = cls.default_templates()
+    def from_package(cls, package, vocab):
+        # TODO: templates.json deprecated? not present in latest package
+        templates = cls.default_templates()
+        # templates = package.load_utf8(json.load,
+        #     'pos', 'templates.json',
+        #     default=cls.default_templates())
+
         model = TaggerModel(vocab.morphology.n_tags,
             ConjunctionExtracter(N_CONTEXT_FIELDS, templates))
-        if path.exists(path.join(data_dir, 'model')):
-            model.load(path.join(data_dir, 'model'))
+
+        if package.has_file('pos', 'model'):  # TODO: really optional?
+            model.load(package.file_path('pos', 'model'))
+
         return cls(vocab, model)
 
     def __init__(self, Vocab vocab, TaggerModel model):
diff --git a/spacy/tests/conftest.py b/spacy/tests/conftest.py
index 6aee2c31e..03e728a12 100644
--- a/spacy/tests/conftest.py
+++ b/spacy/tests/conftest.py
@@ -1,12 +1,11 @@
+from spacy.en import English
+
 import pytest
-from spacy.en import English, LOCAL_DATA_DIR
-import os
 
 
 @pytest.fixture(scope="session")
 def EN():
-    data_dir = os.environ.get('SPACY_DATA', LOCAL_DATA_DIR)
-    return English(data_dir=data_dir)
+    return English()
 
 
 def pytest_addoption(parser):
diff --git a/spacy/tests/serialize/test_packer.py b/spacy/tests/serialize/test_packer.py
index e0d24208a..0e13b2de5 100644
--- a/spacy/tests/serialize/test_packer.py
+++ b/spacy/tests/serialize/test_packer.py
@@ -10,7 +10,6 @@ from spacy.en import English
 from spacy.vocab import Vocab
 from spacy.tokens.doc import Doc
 from spacy.tokenizer import Tokenizer
-from spacy.en import LOCAL_DATA_DIR
 from os import path
 
 from spacy.attrs import ORTH, SPACY, TAG, DEP, HEAD
diff --git a/spacy/tests/spans/conftest.py b/spacy/tests/spans/conftest.py
index f63816e05..d8a0a4cb9 100644
--- a/spacy/tests/spans/conftest.py
+++ b/spacy/tests/spans/conftest.py
@@ -1,9 +1,8 @@
 import pytest
-from spacy.en import English, LOCAL_DATA_DIR
+from spacy.en import English
 import os
 
 
 @pytest.fixture(scope="session")
 def en_nlp():
-    data_dir = os.environ.get('SPACY_DATA', LOCAL_DATA_DIR)
-    return English(data_dir=data_dir)
+    return English()
diff --git a/spacy/tests/tagger/test_lemmatizer.py b/spacy/tests/tagger/test_lemmatizer.py
index 91aa8ee65..e25fbe199 100644
--- a/spacy/tests/tagger/test_lemmatizer.py
+++ b/spacy/tests/tagger/test_lemmatizer.py
@@ -4,31 +4,33 @@ import io
 import pickle
 
 from spacy.lemmatizer import Lemmatizer, read_index, read_exc
-from spacy.en import LOCAL_DATA_DIR
-from os import path
+from spacy.util import get_package
 
 import pytest
 
 
-def test_read_index():
-    wn = path.join(LOCAL_DATA_DIR, 'wordnet')
-    index = read_index(path.join(wn, 'index.noun'))
+@pytest.fixture
+def package():
+    return get_package()
+
+
+@pytest.fixture
+def lemmatizer(package):
+    return Lemmatizer.from_package(package)
+
+
+def test_read_index(package):
+    index = package.load_utf8(read_index, 'wordnet', 'index.noun')
     assert 'man' in index
     assert 'plantes' not in index
     assert 'plant' in index
 
 
-def test_read_exc():
-    wn = path.join(LOCAL_DATA_DIR, 'wordnet')
-    exc = read_exc(path.join(wn, 'verb.exc'))
+def test_read_exc(package):
+    exc = package.load_utf8(read_exc, 'wordnet', 'verb.exc')
     assert exc['was'] == ('be',)
 
 
-@pytest.fixture
-def lemmatizer():
-    return Lemmatizer.from_dir(path.join(LOCAL_DATA_DIR))
-
-
 def test_noun_lemmas(lemmatizer):
     do = lemmatizer.noun
 
diff --git a/spacy/tests/tokens/test_token_references.py b/spacy/tests/tokens/test_token_references.py
index e8dbff6fe..24639f141 100644
--- a/spacy/tests/tokens/test_token_references.py
+++ b/spacy/tests/tokens/test_token_references.py
@@ -2,16 +2,15 @@ from __future__ import unicode_literals
 import pytest
 import gc
 
-from spacy.en import English, LOCAL_DATA_DIR
+from spacy.en import English
 import os
 
-data_dir = os.environ.get('SPACY_DATA', LOCAL_DATA_DIR)
 # Let this have its own instances, as we have to be careful about memory here
 # that's the point, after all
 
 @pytest.mark.models
 def get_orphan_token(text, i):
-    nlp = English(data_dir=data_dir)
+    nlp = English()
     tokens = nlp(text)
     gc.collect()
     token = tokens[i]
@@ -41,7 +40,7 @@ def _orphan_from_list(toks):
 @pytest.mark.models
 def test_list_orphans():
     # Test case from NSchrading
-    nlp = English(data_dir=data_dir)
+    nlp = English()
     samples = ["a", "test blah wat okay"]
     lst = []
     for sample in samples:
diff --git a/spacy/tests/website/conftest.py b/spacy/tests/website/conftest.py
index 35c38d845..b4934d20b 100644
--- a/spacy/tests/website/conftest.py
+++ b/spacy/tests/website/conftest.py
@@ -5,9 +5,8 @@ import os
 
 @pytest.fixture(scope='session')
 def nlp():
-    from spacy.en import English, LOCAL_DATA_DIR
-    data_dir = os.environ.get('SPACY_DATA', LOCAL_DATA_DIR)
-    return English(data_dir=data_dir)
+    from spacy.en import English
+    return English()
 
 
 @pytest.fixture()
diff --git a/spacy/tests/website/test_home.py b/spacy/tests/website/test_home.py
index f1c4d7062..5317e7e56 100644
--- a/spacy/tests/website/test_home.py
+++ b/spacy/tests/website/test_home.py
@@ -10,9 +10,8 @@ def token(doc):
 
 
 def test_load_resources_and_process_text():
-    from spacy.en import English, LOCAL_DATA_DIR
-    data_dir = os.environ.get('SPACY_DATA', LOCAL_DATA_DIR)
-    nlp = English(data_dir=data_dir)
+    from spacy.en import English
+    nlp = English()
     doc = nlp('Hello, world. Here are two sentences.')
 
 
diff --git a/spacy/tokenizer.pyx b/spacy/tokenizer.pyx
index 1cde1e76e..345734682 100644
--- a/spacy/tokenizer.pyx
+++ b/spacy/tokenizer.pyx
@@ -41,8 +41,8 @@ cdef class Tokenizer:
         return (self.__class__, args, None, None)
 
     @classmethod
-    def from_dir(cls, Vocab vocab, data_dir):
-        rules, prefix_re, suffix_re, infix_re = read_lang_data(data_dir)
+    def from_package(cls, package, Vocab vocab):
+        rules, prefix_re, suffix_re, infix_re = read_lang_data(package)
         prefix_re = re.compile(prefix_re)
         suffix_re = re.compile(suffix_re)
         infix_re = re.compile(infix_re)
diff --git a/spacy/util.py b/spacy/util.py
index 849a3e219..8c9ea319c 100644
--- a/spacy/util.py
+++ b/spacy/util.py
@@ -1,10 +1,24 @@
-from os import path
+import os
 import io
 import json
 import re
+
+from sputnik import Sputnik
+
 from .attrs import TAG, HEAD, DEP, ENT_IOB, ENT_TYPE
 
-DATA_DIR = path.join(path.dirname(__file__), '..', 'data')
+
+def get_package(name=None, data_path=None):
+    if data_path is None:
+        if os.environ.get('SPACY_DATA'):
+            data_path = os.environ.get('SPACY_DATA')
+        else:
+            data_path = os.path.abspath(
+                os.path.join(os.path.dirname(__file__), 'data'))
+
+    sputnik = Sputnik('spacy', '0.100.0')  # TODO: retrieve version
+    pool = sputnik.pool(data_path)
+    return pool.get(name or 'en_default')
 
 
 def normalize_slice(length, start, stop, step=None):
@@ -31,67 +45,63 @@ def utf8open(loc, mode='r'):
     return io.open(loc, mode, encoding='utf8')
 
 
-def read_lang_data(data_dir):
-    with open(path.join(data_dir, 'specials.json')) as file_:
-        tokenization = json.load(file_)
-    prefix = read_prefix(data_dir)
-    suffix = read_suffix(data_dir)
-    infix = read_infix(data_dir)
+def read_lang_data(package):
+    tokenization = package.load_utf8(json.load, 'tokenizer', 'specials.json')
+    prefix = package.load_utf8(read_prefix, 'tokenizer', 'prefix.txt')
+    suffix = package.load_utf8(read_suffix, 'tokenizer', 'suffix.txt')
+    infix = package.load_utf8(read_infix, 'tokenizer', 'infix.txt')
     return tokenization, prefix, suffix, infix
 
 
-def read_prefix(data_dir):
-    with  utf8open(path.join(data_dir, 'prefix.txt')) as file_:
-        entries = file_.read().split('\n')
-        expression = '|'.join(['^' + re.escape(piece) for piece in entries if piece.strip()])
+def read_prefix(fileobj):
+    entries = fileobj.read().split('\n')
+    expression = '|'.join(['^' + re.escape(piece) for piece in entries if piece.strip()])
     return expression
 
 
-def read_suffix(data_dir):
-    with utf8open(path.join(data_dir, 'suffix.txt')) as file_:
-        entries = file_.read().split('\n')
-        expression = '|'.join([piece + '$' for piece in entries if piece.strip()])
+def read_suffix(fileobj):
+    entries = fileobj.read().split('\n')
+    expression = '|'.join([piece + '$' for piece in entries if piece.strip()])
     return expression
 
 
-def read_infix(data_dir):
-    with utf8open(path.join(data_dir, 'infix.txt')) as file_:
-        entries = file_.read().split('\n')
-        expression = '|'.join([piece for piece in entries if piece.strip()])
+def read_infix(fileobj):
+    entries = fileobj.read().split('\n')
+    expression = '|'.join([piece for piece in entries if piece.strip()])
     return expression
 
 
-def read_tokenization(lang):
-    loc = path.join(DATA_DIR, lang, 'tokenization')
-    entries = []
-    seen = set()
-    with utf8open(loc) as file_:
-        for line in file_:
-            line = line.strip()
-            if line.startswith('#'):
-                continue
-            if not line:
-                continue
-            pieces = line.split()
-            chunk = pieces.pop(0)
-            assert chunk not in seen, chunk
-            seen.add(chunk)
-            entries.append((chunk, list(pieces)))
-            if chunk[0].isalpha() and chunk[0].islower():
-                chunk = chunk[0].title() + chunk[1:]
-                pieces[0] = pieces[0][0].title() + pieces[0][1:]
-                seen.add(chunk)
-                entries.append((chunk, pieces))
-    return entries
+# def read_tokenization(lang):
+#     loc = path.join(DATA_DIR, lang, 'tokenization')
+#     entries = []
+#     seen = set()
+#     with utf8open(loc) as file_:
+#         for line in file_:
+#             line = line.strip()
+#             if line.startswith('#'):
+#                 continue
+#             if not line:
+#                 continue
+#             pieces = line.split()
+#             chunk = pieces.pop(0)
+#             assert chunk not in seen, chunk
+#             seen.add(chunk)
+#             entries.append((chunk, list(pieces)))
+#             if chunk[0].isalpha() and chunk[0].islower():
+#                 chunk = chunk[0].title() + chunk[1:]
+#                 pieces[0] = pieces[0][0].title() + pieces[0][1:]
+#                 seen.add(chunk)
+#                 entries.append((chunk, pieces))
+#     return entries
 
 
-def read_detoken_rules(lang): # Deprecated?
-    loc = path.join(DATA_DIR, lang, 'detokenize')
-    entries = []
-    with utf8open(loc) as file_:
-        for line in file_:
-            entries.append(line.strip())
-    return entries
+# def read_detoken_rules(lang): # Deprecated?
+#     loc = path.join(DATA_DIR, lang, 'detokenize')
+#     entries = []
+#     with utf8open(loc) as file_:
+#         for line in file_:
+#             entries.append(line.strip())
+#     return entries
 
 
 def align_tokens(ref, indices): # Deprecated, surely?
diff --git a/spacy/vocab.pyx b/spacy/vocab.pyx
index 3817e7127..bb0ae6173 100644
--- a/spacy/vocab.pyx
+++ b/spacy/vocab.pyx
@@ -47,28 +47,27 @@ cdef class Vocab:
     '''A map container for a language's LexemeC structs.
     '''
     @classmethod
-    def from_dir(cls, data_dir, get_lex_attr=None):
-        if not path.exists(data_dir):
-            raise IOError("Directory %s not found -- cannot load Vocab." % data_dir)
-        if not path.isdir(data_dir):
-            raise IOError("Path %s is a file, not a dir -- cannot load Vocab." % data_dir)
+    def from_package(cls, package, get_lex_attr=None):
+        tag_map = package.load_utf8(json.load,
+            'vocab', 'tag_map.json')
+
+        lemmatizer = Lemmatizer.from_package(package)
+
+        serializer_freqs = package.load_utf8(json.load,
+            'vocab', 'serializer.json',
+            require=False)  # TODO: really optional?
 
-        tag_map = json.load(open(path.join(data_dir, 'tag_map.json')))
-        lemmatizer = Lemmatizer.from_dir(path.join(data_dir, '..'))
-        if path.exists(path.join(data_dir, 'serializer.json')):
-            serializer_freqs = json.load(open(path.join(data_dir, 'serializer.json')))
-        else:
-            serializer_freqs = None
         cdef Vocab self = cls(get_lex_attr=get_lex_attr, tag_map=tag_map,
                               lemmatizer=lemmatizer, serializer_freqs=serializer_freqs)
 
-        if path.exists(path.join(data_dir, 'strings.json')):
-            with io.open(path.join(data_dir, 'strings.json'), 'r', encoding='utf8') as file_:
-                self.strings.load(file_)
-            self.load_lexemes(path.join(data_dir, 'lexemes.bin'))
-                
-        if path.exists(path.join(data_dir, 'vec.bin')):
-            self.vectors_length = self.load_vectors_from_bin_loc(path.join(data_dir, 'vec.bin'))
+        if package.has_file('vocab', 'strings.json'):  # TODO: really optional?
+            package.load_utf8(self.strings.load, 'vocab', 'strings.json')
+            self.load_lexemes(package.file_path('vocab', 'lexemes.bin'))
+
+        if package.has_file('vocab', 'vec.bin'):  # TODO: really optional?
+            self.vectors_length = self.load_vectors_from_bin_loc(
+                package.file_path('vocab', 'vec.bin'))
+
         return self
 
     def __init__(self, get_lex_attr=None, tag_map=None, lemmatizer=None, serializer_freqs=None):