diff --git a/src/Microsoft.AspNet.FeatureModel/FeatureCollection.cs b/src/Microsoft.AspNet.FeatureModel/FeatureCollection.cs
index 3b3f05b2b2..b86a3832b1 100644
--- a/src/Microsoft.AspNet.FeatureModel/FeatureCollection.cs
+++ b/src/Microsoft.AspNet.FeatureModel/FeatureCollection.cs
@@ -31,9 +31,8 @@ namespace Microsoft.AspNet.FeatureModel
             return GetInterface(null);
         }
 
-        public object GetInterface(Type type)
+        public object GetInterface([NotNull] Type type)
         {
-            if (type == null) throw new ArgumentNullException("type");
             object feature;
             if (_featureByFeatureType.TryGetValue(type, out feature))
             {
@@ -63,10 +62,8 @@ namespace Microsoft.AspNet.FeatureModel
             return null;
         }
 
-        void SetInterface(Type type, object feature)
+        void SetInterface([NotNull] Type type, object feature)
         {
-            if (type == null) throw new ArgumentNullException("type");
-
             if (feature == null)
             {
                 Remove(type);
@@ -153,16 +150,13 @@ namespace Microsoft.AspNet.FeatureModel
             get { return false; }
         }
 
-        public bool ContainsKey(Type key)
+        public bool ContainsKey([NotNull] Type key)
         {
-            if (key == null) throw new ArgumentNullException("key");
             return GetInterface(key) != null;
         }
 
-        public void Add(Type key, object value)
+        public void Add([NotNull] Type key, [NotNull] object value)
         {
-            if (key == null) throw new ArgumentNullException("key");
-            if (value == null) throw new ArgumentNullException("value");
             if (ContainsKey(key))
             {
                 throw new ArgumentException();
@@ -170,10 +164,8 @@ namespace Microsoft.AspNet.FeatureModel
             SetInterface(key, value);
         }
 
-        public bool Remove(Type key)
+        public bool Remove([NotNull] Type key)
         {
-            if (key == null) throw new ArgumentNullException("key");
-
             lock (_containerSync)
             {
                 Type priorFeatureType;
@@ -188,7 +180,7 @@ namespace Microsoft.AspNet.FeatureModel
             }
         }
 
-        public bool TryGetValue(Type key, out object value)
+        public bool TryGetValue([NotNull] Type key, out object value)
         {
             value = GetInterface(key);
             return value != null;
diff --git a/src/Microsoft.AspNet.FeatureModel/NotNullAttribute.cs b/src/Microsoft.AspNet.FeatureModel/NotNullAttribute.cs
new file mode 100644
index 0000000000..3869edda12
--- /dev/null
+++ b/src/Microsoft.AspNet.FeatureModel/NotNullAttribute.cs
@@ -0,0 +1,12 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+
+namespace Microsoft.AspNet.FeatureModel
+{
+    [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)]
+    internal sealed class NotNullAttribute : Attribute
+    {
+    }
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.FeatureModel/project.json b/src/Microsoft.AspNet.FeatureModel/project.json
index 595978bef8..5e0b3bc67f 100644
--- a/src/Microsoft.AspNet.FeatureModel/project.json
+++ b/src/Microsoft.AspNet.FeatureModel/project.json
@@ -1,6 +1,8 @@
 {
   "version": "1.0.0-*",
-  "dependencies": {},
+  "dependencies": {
+    "Microsoft.Framework.Runtime.Interfaces": "1.0.0-*"
+  },
   "frameworks": {
     "aspnet50": {},
     "aspnetcore50": {
diff --git a/src/Microsoft.AspNet.Http.Extensions/SessionCollectionExtensions.cs b/src/Microsoft.AspNet.Http.Extensions/SessionCollectionExtensions.cs
new file mode 100644
index 0000000000..d13f34be02
--- /dev/null
+++ b/src/Microsoft.AspNet.Http.Extensions/SessionCollectionExtensions.cs
@@ -0,0 +1,60 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Text;
+
+namespace Microsoft.AspNet.Http
+{
+    public static class SessionCollectionExtensions
+    {
+        public static void SetInt(this ISessionCollection session, string key, int value)
+        {
+            var bytes = new byte[]
+            {
+                (byte)(value >> 24),
+                (byte)(0xFF & (value >> 16)),
+                (byte)(0xFF & (value >> 8)),
+                (byte)(0xFF & value)
+            };
+            session.Set(key, bytes);
+        }
+
+        public static int? GetInt(this ISessionCollection session, string key)
+        {
+            var data = session.Get(key);
+            if (data == null || data.Length < 4)
+            {
+                return null;
+            }
+            return data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
+        }
+
+        public static void SetString(this ISessionCollection session, string key, string value)
+        {
+            session.Set(key, Encoding.UTF8.GetBytes(value));
+        }
+
+        public static string GetString(this ISessionCollection session, string key)
+        {
+            var data = session.Get(key);
+            if (data == null)
+            {
+                return null;
+            }
+            return Encoding.UTF8.GetString(data);
+        }
+
+        public static byte[] Get(this ISessionCollection session, string key)
+        {
+            byte[] value = null;
+            session.TryGetValue(key, out value);
+            return value;
+        }
+
+        public static void Set(this ISessionCollection session, string key, byte[] value)
+        {
+            session.Set(key, new ArraySegment<byte>(value));
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.Http.Extensions/project.json b/src/Microsoft.AspNet.Http.Extensions/project.json
index d8391b0906..eb0b74711f 100644
--- a/src/Microsoft.AspNet.Http.Extensions/project.json
+++ b/src/Microsoft.AspNet.Http.Extensions/project.json
@@ -9,8 +9,6 @@
         },
         "aspnetcore50" : { 
             "dependencies": {
-                "System.Reflection": "4.0.10-beta-*",
-                "System.Reflection.Extensions": "4.0.0-beta-*",
                 "System.Reflection.TypeExtensions": "4.0.0-beta-*",
                 "System.Runtime": "4.0.20-beta-*"
             }
diff --git a/src/Microsoft.AspNet.Http/HttpContext.cs b/src/Microsoft.AspNet.Http/HttpContext.cs
index 191c3f02a6..094b6671eb 100644
--- a/src/Microsoft.AspNet.Http/HttpContext.cs
+++ b/src/Microsoft.AspNet.Http/HttpContext.cs
@@ -28,6 +28,8 @@ namespace Microsoft.AspNet.Http
 
         public abstract CancellationToken RequestAborted { get; }
 
+        public abstract ISessionCollection Session { get; }
+
         public abstract bool IsWebSocketRequest { get; }
 
         public abstract IList<string> WebSocketRequestedProtocols { get; }
diff --git a/src/Microsoft.AspNet.Http/ISessionCollection.cs b/src/Microsoft.AspNet.Http/ISessionCollection.cs
new file mode 100644
index 0000000000..5dd3029c78
--- /dev/null
+++ b/src/Microsoft.AspNet.Http/ISessionCollection.cs
@@ -0,0 +1,21 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+
+namespace Microsoft.AspNet.Http
+{
+    public interface ISessionCollection : IEnumerable<KeyValuePair<string, byte[]>>
+    {
+        byte[] this[string key] { get; set; }
+
+        bool TryGetValue(string key, out byte[] value);
+
+        void Set(string key, ArraySegment<byte> value);
+
+        void Remove(string key);
+
+        void Clear();
+    }
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.HttpFeature/ISession.cs b/src/Microsoft.AspNet.HttpFeature/ISession.cs
new file mode 100644
index 0000000000..6a0fe4035a
--- /dev/null
+++ b/src/Microsoft.AspNet.HttpFeature/ISession.cs
@@ -0,0 +1,27 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using Microsoft.Framework.Runtime;
+
+namespace Microsoft.AspNet.HttpFeature
+{
+    [AssemblyNeutral]
+    public interface ISession
+    {
+        void Load();
+
+        void Commit();
+
+        bool TryGetValue(string key, out byte[] value);
+
+        void Set(string key, ArraySegment<byte> value);
+
+        void Remove(string key);
+
+        void Clear();
+
+        IEnumerable<string> Keys { get; }
+    }
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.HttpFeature/ISessionFactory.cs b/src/Microsoft.AspNet.HttpFeature/ISessionFactory.cs
new file mode 100644
index 0000000000..1187696726
--- /dev/null
+++ b/src/Microsoft.AspNet.HttpFeature/ISessionFactory.cs
@@ -0,0 +1,16 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using Microsoft.Framework.Runtime;
+
+namespace Microsoft.AspNet.HttpFeature
+{
+    [AssemblyNeutral]
+    public interface ISessionFactory
+    {
+        bool IsAvailable { get; }
+
+        ISession Create();
+    }
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.HttpFeature/ISessionFeature.cs b/src/Microsoft.AspNet.HttpFeature/ISessionFeature.cs
new file mode 100644
index 0000000000..400f365b68
--- /dev/null
+++ b/src/Microsoft.AspNet.HttpFeature/ISessionFeature.cs
@@ -0,0 +1,16 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using Microsoft.Framework.Runtime;
+
+namespace Microsoft.AspNet.HttpFeature
+{
+    // TODO: Is there any reason not to flatten the Factory down into the Feature?
+    [AssemblyNeutral]
+    public interface ISessionFeature
+    {
+        ISessionFactory Factory { get; set; }
+
+        ISession Session { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.PipelineCore/Collections/SessionCollection.cs b/src/Microsoft.AspNet.PipelineCore/Collections/SessionCollection.cs
new file mode 100644
index 0000000000..261b401cdb
--- /dev/null
+++ b/src/Microsoft.AspNet.PipelineCore/Collections/SessionCollection.cs
@@ -0,0 +1,75 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using Microsoft.AspNet.Http;
+using Microsoft.AspNet.HttpFeature;
+
+namespace Microsoft.AspNet.PipelineCore.Collections
+{
+    public class SessionCollection : ISessionCollection
+    {
+        private readonly ISession _session;
+
+        public SessionCollection(ISession session)
+        {
+            _session = session;
+        }
+
+        public byte[] this[string key]
+        {
+            get
+            {
+                byte[] value;
+                TryGetValue(key, out value);
+                return value;
+            }
+            set
+            {
+                if (value == null)
+                {
+                    Remove(key);
+                }
+                else
+                {
+                    Set(key, new ArraySegment<byte>(value));
+                }
+            }
+        }
+
+        public bool TryGetValue(string key, out byte[] value)
+        {
+            return _session.TryGetValue(key, out value);
+        }
+
+        public void Set(string key, ArraySegment<byte> value)
+        {
+            _session.Set(key, value);
+        }
+
+        public void Remove(string key)
+        {
+            _session.Remove(key);
+        }
+
+        public void Clear()
+        {
+            _session.Clear();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+
+        public IEnumerator<KeyValuePair<string, byte[]>> GetEnumerator()
+        {
+            foreach (var key in _session.Keys)
+            {
+                yield return new KeyValuePair<string, byte[]>(key, this[key]);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.PipelineCore/DefaultHttpContext.cs b/src/Microsoft.AspNet.PipelineCore/DefaultHttpContext.cs
index 148ef84e19..308d896564 100644
--- a/src/Microsoft.AspNet.PipelineCore/DefaultHttpContext.cs
+++ b/src/Microsoft.AspNet.PipelineCore/DefaultHttpContext.cs
@@ -14,6 +14,7 @@ using Microsoft.AspNet.Http.Infrastructure;
 using Microsoft.AspNet.Http.Security;
 using Microsoft.AspNet.HttpFeature;
 using Microsoft.AspNet.HttpFeature.Security;
+using Microsoft.AspNet.PipelineCore.Collections;
 using Microsoft.AspNet.PipelineCore.Infrastructure;
 using Microsoft.AspNet.PipelineCore.Security;
 
@@ -31,6 +32,7 @@ namespace Microsoft.AspNet.PipelineCore
         private FeatureReference<IHttpAuthenticationFeature> _authentication;
         private FeatureReference<IHttpRequestLifetimeFeature> _lifetime;
         private FeatureReference<IHttpWebSocketFeature> _webSockets;
+        private FeatureReference<ISessionFeature> _session;
         private IFeatureCollection _features;
 
         public DefaultHttpContext()
@@ -51,6 +53,7 @@ namespace Microsoft.AspNet.PipelineCore
             _authentication = FeatureReference<IHttpAuthenticationFeature>.Default;
             _lifetime = FeatureReference<IHttpRequestLifetimeFeature>.Default;
             _webSockets = FeatureReference<IHttpWebSocketFeature>.Default;
+            _session = FeatureReference<ISessionFeature>.Default;
         }
 
         IItemsFeature ItemsFeature
@@ -78,6 +81,11 @@ namespace Microsoft.AspNet.PipelineCore
             get { return _webSockets.Fetch(_features); }
         }
 
+        private ISessionFeature SessionFeature
+        {
+            get { return _session.Fetch(_features); }
+        }
+
         public override HttpRequest Request { get { return _request; } }
 
         public override HttpResponse Response { get { return _response; } }
@@ -129,6 +137,27 @@ namespace Microsoft.AspNet.PipelineCore
             }
         }
 
+        public override ISessionCollection Session
+        {
+            get
+            {
+                var feature = SessionFeature;
+                if (feature == null)
+                {
+                    throw new InvalidOperationException("Session has not been configured for this application or request.");
+                }
+                if (feature.Session == null)
+                {
+                    if (feature.Factory == null)
+                    {
+                        throw new InvalidOperationException("No ISessionFactory available to create the ISession.");
+                    }
+                    feature.Session = feature.Factory.Create();
+                }
+                return new SessionCollection(feature.Session);
+            }
+        }
+
         public override bool IsWebSocketRequest
         {
             get