diff --git a/src/main/java/com/google/gcloud/storage/Acl.java b/src/main/java/com/google/gcloud/storage/Acl.java
index 138ba4f3fa3a..b5bb685334c1 100644
--- a/src/main/java/com/google/gcloud/storage/Acl.java
+++ b/src/main/java/com/google/gcloud/storage/Acl.java
@@ -20,6 +20,7 @@
 import com.google.api.services.storage.model.ObjectAccessControl;
 
 import java.io.Serializable;
+import java.util.Objects;
 
 /**
  *  Access Control List on for buckets or blobs.
@@ -59,6 +60,19 @@ protected String value() {
       return value;
     }
 
+    @Override
+    public int hashCode() {
+      return Objects.hash(type, value);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (obj == null || !getClass().isAssignableFrom(obj.getClass())) {
+        return false;
+      }
+      return Objects.equals(toPb(), ((Entity)obj).toPb());
+    }
+
     @Override
     public String toString() {
       return toPb();
@@ -91,13 +105,12 @@ static Entity fromPb(String entity) {
     }
   }
 
-  public static class Domain extends Entity {
+  public static final class Domain extends Entity {
 
     private static final long serialVersionUID = -3033025857280447253L;
 
     public Domain(String domain) {
       super(Type.DOMAIN, domain);
-
     }
 
     public String domain() {
@@ -105,7 +118,7 @@ public String domain() {
     }
   }
 
-  public static class Group extends Entity {
+  public static final class Group extends Entity {
 
     private static final long serialVersionUID = -1660987136294408826L;
 
@@ -118,7 +131,7 @@ public String email() {
     }
   }
 
-  public static class User extends Entity {
+  public static final class User extends Entity {
 
     private static final long serialVersionUID = 3076518036392737008L;
     private static final String ALL_USERS = "allUsers";
@@ -154,7 +167,7 @@ public static User ofAllAuthenticatedUsers() {
     }
   }
 
-  public static class Project extends Entity {
+  public static final class Project extends Entity {
 
     private static final long serialVersionUID = 7933776866530023027L;
 
@@ -180,7 +193,7 @@ public String projectId() {
     }
   }
 
-  public static class RawEntity extends Entity {
+  public static final class RawEntity extends Entity {
 
     private static final long serialVersionUID = 3966205614223053950L;
 
diff --git a/src/main/java/com/google/gcloud/storage/BatchRequest.java b/src/main/java/com/google/gcloud/storage/BatchRequest.java
index 9fbee876cf45..6f62d5c51ae4 100644
--- a/src/main/java/com/google/gcloud/storage/BatchRequest.java
+++ b/src/main/java/com/google/gcloud/storage/BatchRequest.java
@@ -17,51 +17,56 @@
 package com.google.gcloud.storage;
 
 import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Lists;
 import com.google.gcloud.storage.StorageService.BlobSourceOption;
 import com.google.gcloud.storage.StorageService.BlobTargetOption;
 
 import java.io.Serializable;
 import java.util.LinkedHashMap;
 import java.util.Map;
+import java.util.Objects;
 
 /**
  * Google storage batch request.
  */
-public class BatchRequest implements Serializable {
+public final class BatchRequest implements Serializable {
 
   private static final long serialVersionUID = -1527992265939800345L;
 
-  private final Map<Blob, BlobSourceOption[]> toDelete;
-  private final Map<Blob, BlobTargetOption[]> toUpdate;
-  private final Map<Blob, BlobSourceOption[]> toGet;
+  private final Map<Blob, Iterable<BlobSourceOption>> toDelete;
+  private final Map<Blob, Iterable<BlobTargetOption>> toUpdate;
+  private final Map<Blob, Iterable<BlobSourceOption>> toGet;
 
   public static class Builder {
 
-    private Map<Blob, BlobSourceOption[]> toDelete = new LinkedHashMap<>();
-    private Map<Blob, BlobTargetOption[]> toUpdate = new LinkedHashMap<>();
-    private Map<Blob, BlobSourceOption[]> toGet = new LinkedHashMap<>();
+    private Map<Blob, Iterable<BlobSourceOption>> toDelete = new LinkedHashMap<>();
+    private Map<Blob, Iterable<BlobTargetOption>> toUpdate = new LinkedHashMap<>();
+    private Map<Blob, Iterable<BlobSourceOption>> toGet = new LinkedHashMap<>();
 
     private Builder() {}
 
     /**
      * Delete the given blob.
      */
-    public void delete(String bucket, String blob, BlobSourceOption... options) {
-      toDelete.put(Blob.of(bucket, blob), options);
+    public Builder delete(String bucket, String blob, BlobSourceOption... options) {
+      toDelete.put(Blob.of(bucket, blob), Lists.newArrayList(options));
+      return this;
     }
 
     /**
      * Update the given blob.
      */
-    public void update(Blob blob, BlobTargetOption... options) {
-      toUpdate.put(blob, options);
+    public Builder update(Blob blob, BlobTargetOption... options) {
+      toUpdate.put(blob, Lists.newArrayList(options));
+      return this;
     }
 
     /**
      * Retrieve metadata for the given blob.
      */
-    public void get(String bucket, String blob, BlobSourceOption... options) {
-      toGet.put(Blob.of(bucket, blob), options);
+    public Builder get(String bucket, String blob, BlobSourceOption... options) {
+      toGet.put(Blob.of(bucket, blob), Lists.newArrayList(options));
+      return this;
     }
 
     public BatchRequest build() {
@@ -75,15 +80,31 @@ private BatchRequest(Builder builder) {
     toGet = ImmutableMap.copyOf(builder.toGet);
   }
 
-  Map<Blob, BlobSourceOption[]> toDelete() {
+  @Override
+  public int hashCode() {
+    return Objects.hash(toDelete, toUpdate, toGet);
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (!(obj instanceof BatchRequest)) {
+      return false;
+    }
+    BatchRequest other = (BatchRequest) obj;
+    return Objects.equals(toDelete, other.toDelete)
+        && Objects.equals(toUpdate, other.toUpdate)
+        && Objects.equals(toGet, other.toGet);
+  }
+
+  Map<Blob, Iterable<BlobSourceOption>> toDelete() {
     return toDelete;
   }
 
-  Map<Blob, BlobTargetOption[]> toUpdate() {
+  Map<Blob, Iterable<BlobTargetOption>> toUpdate() {
     return toUpdate;
   }
 
-  Map<Blob, BlobSourceOption[]> toGet() {
+  Map<Blob, Iterable<BlobSourceOption>> toGet() {
     return toGet;
   }
 
diff --git a/src/main/java/com/google/gcloud/storage/BatchResponse.java b/src/main/java/com/google/gcloud/storage/BatchResponse.java
index fab4d964e1c6..c45b0623eb9b 100644
--- a/src/main/java/com/google/gcloud/storage/BatchResponse.java
+++ b/src/main/java/com/google/gcloud/storage/BatchResponse.java
@@ -21,11 +21,12 @@
 
 import java.io.Serializable;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * Google Storage batch response.
  */
-public class BatchResponse implements Serializable {
+public final class BatchResponse implements Serializable {
 
   private static final long serialVersionUID = 1057416839397037706L;
 
@@ -78,6 +79,21 @@ public boolean failed() {
       return exception != null;
     }
 
+    @Override
+    public int hashCode() {
+      return Objects.hash(value, exception);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (!(obj instanceof Result)) {
+        return false;
+      }
+      Result<?> other = (Result<?>) obj;
+      return Objects.equals(value, other.value)
+          && Objects.equals(exception, other.exception);
+    }
+
     @Override
     public String toString() {
       return MoreObjects.toStringHelper(this)
@@ -99,6 +115,22 @@ static <T extends Serializable> Result<T> empty() {
     this.getResult = ImmutableList.copyOf(getResult);
   }
 
+  @Override
+  public int hashCode() {
+    return Objects.hash(deleteResult, updateResult, getResult);
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (!(obj instanceof BatchResponse)) {
+      return false;
+    }
+    BatchResponse other = (BatchResponse) obj;
+    return Objects.equals(deleteResult, other.deleteResult)
+        && Objects.equals(updateResult, other.updateResult)
+        && Objects.equals(updateResult, other.updateResult);
+  }
+
   /**
    * Returns the results for the delete operations using the request order.
    */
diff --git a/src/main/java/com/google/gcloud/storage/Blob.java b/src/main/java/com/google/gcloud/storage/Blob.java
index ffaec524c67d..7ef81bf2b240 100644
--- a/src/main/java/com/google/gcloud/storage/Blob.java
+++ b/src/main/java/com/google/gcloud/storage/Blob.java
@@ -32,13 +32,14 @@
 import java.math.BigInteger;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 
 /**
  * A Google Storage object.
  *
  * @see <a href="https://cloud.google.com/storage/docs/concepts-techniques#concepts">Concepts and Terminology</a>
  */
-public class Blob implements Serializable {
+public final class Blob implements Serializable {
 
   private static final long serialVersionUID = 2228487739943277159L;
 
@@ -386,6 +387,19 @@ public static Builder builder(String bucket, String name) {
     return new Builder().bucket(bucket).name(name);
   }
 
+  @Override
+  public int hashCode() {
+    return Objects.hash(bucket, name);
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (!(obj instanceof Blob)) {
+      return  false;
+    }
+    return Objects.equals(toPb(), ((Blob)obj).toPb());
+  }
+
   StorageObject toPb() {
     StorageObject storageObject = new StorageObject();
     if (acl != null) {
diff --git a/src/main/java/com/google/gcloud/storage/Bucket.java b/src/main/java/com/google/gcloud/storage/Bucket.java
index 7f68704f9e6a..c36b24c80269 100644
--- a/src/main/java/com/google/gcloud/storage/Bucket.java
+++ b/src/main/java/com/google/gcloud/storage/Bucket.java
@@ -39,6 +39,7 @@
 import java.io.ObjectOutputStream;
 import java.io.Serializable;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * A Google Storage bucket.
@@ -559,6 +560,19 @@ public Builder toBuilder() {
         .deleteRules(deleteRules);
   }
 
+  @Override
+  public int hashCode() {
+    return Objects.hash(name);
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (!(obj instanceof Bucket)) {
+      return  false;
+    }
+    return Objects.equals(toPb(), ((Bucket) obj).toPb());
+  }
+
   @Override
   public String toString() {
     return MoreObjects.toStringHelper(this)
diff --git a/src/main/java/com/google/gcloud/storage/Cors.java b/src/main/java/com/google/gcloud/storage/Cors.java
index 366c8d9223bd..9cedbc0d3b4c 100644
--- a/src/main/java/com/google/gcloud/storage/Cors.java
+++ b/src/main/java/com/google/gcloud/storage/Cors.java
@@ -29,6 +29,7 @@
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * Cross-Origin Resource Sharing (CORS) configuration for a bucket.
@@ -60,7 +61,7 @@ public enum Method {
     ANY, GET, HEAD, PUT, POST, DELETE
   }
 
-  public static class Origin implements Serializable {
+  public static final class Origin implements Serializable {
 
     private static final long serialVersionUID = -4447958124895577993L;
     private static final String ANY_URI = "*";
@@ -91,6 +92,19 @@ public static Origin of(String value) {
       return new Origin(value);
     }
 
+    @Override
+    public int hashCode() {
+      return value.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (!(obj instanceof Origin)) {
+        return false;
+      }
+      return value.equals(((Origin)obj).value);
+    }
+
     @Override
     public String toString() {
       return value();
@@ -166,6 +180,23 @@ public Builder toBuilder() {
         .responseHeaders(responseHeaders);
   }
 
+  @Override
+  public int hashCode() {
+    return Objects.hash(maxAgeSeconds, methods, origins, responseHeaders);
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (!(obj instanceof Cors)) {
+      return false;
+    }
+    Cors other = (Cors) obj;
+    return Objects.equals(maxAgeSeconds, other.maxAgeSeconds)
+        && Objects.equals(methods, other.methods)
+        && Objects.equals(origins, other.origins)
+        && Objects.equals(responseHeaders, other.responseHeaders);
+  }
+
   public static Builder builder() {
     return new Builder();
   }
diff --git a/src/main/java/com/google/gcloud/storage/ListResult.java b/src/main/java/com/google/gcloud/storage/ListResult.java
index 180e5f7a4155..dd843020376e 100644
--- a/src/main/java/com/google/gcloud/storage/ListResult.java
+++ b/src/main/java/com/google/gcloud/storage/ListResult.java
@@ -18,11 +18,12 @@
 
 import java.io.Serializable;
 import java.util.Iterator;
+import java.util.Objects;
 
 /**
  * Google Cloud storage list result.
  */
-public class ListResult<T extends Serializable> implements Iterable<T>, Serializable {
+public final class ListResult<T extends Serializable> implements Iterable<T>, Serializable {
 
   private static final long serialVersionUID = -6937287874908527950L;
 
@@ -42,4 +43,19 @@ public String nextPageCursor() {
   public Iterator<T> iterator() {
     return results.iterator();
   }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(cursor, results);
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (!(obj instanceof ListResult)) {
+      return false;
+    }
+    ListResult<?> other = (ListResult<?>) obj;
+    return Objects.equals(cursor, other.cursor)
+        && Objects.equals(results, other.results);
+  }
 }
diff --git a/src/main/java/com/google/gcloud/storage/StorageServiceImpl.java b/src/main/java/com/google/gcloud/storage/StorageServiceImpl.java
index 02bbb97a2fe5..1f66401105d0 100644
--- a/src/main/java/com/google/gcloud/storage/StorageServiceImpl.java
+++ b/src/main/java/com/google/gcloud/storage/StorageServiceImpl.java
@@ -302,24 +302,27 @@ public byte[] call() {
   public BatchResponse apply(BatchRequest batchRequest) {
     List<Tuple<StorageObject, Map<StorageRpc.Option, ?>>> toDelete =
         Lists.newArrayListWithCapacity(batchRequest.toDelete().size());
-    for (Map.Entry<Blob, BlobSourceOption[]> entry : batchRequest.toDelete().entrySet()) {
+    for (Map.Entry<Blob, Iterable<BlobSourceOption>> entry : batchRequest.toDelete().entrySet()) {
       Blob blob = entry.getKey();
-      Map<StorageRpc.Option, ?> optionsMap = optionMap(blob, entry.getValue());
+      Map<StorageRpc.Option, ?> optionsMap =
+          optionMap(blob.generation(), blob.metageneration(), entry.getValue());
       StorageObject storageObject = blob.toPb();
       toDelete.add(Tuple.<StorageObject, Map<StorageRpc.Option, ?>>of(storageObject, optionsMap));
     }
     List<Tuple<StorageObject, Map<StorageRpc.Option, ?>>> toUpdate =
         Lists.newArrayListWithCapacity(batchRequest.toUpdate().size());
-    for (Map.Entry<Blob, BlobTargetOption[]> entry : batchRequest.toUpdate().entrySet()) {
+    for (Map.Entry<Blob, Iterable<BlobTargetOption>> entry : batchRequest.toUpdate().entrySet()) {
       Blob blob = entry.getKey();
-      Map<StorageRpc.Option, ?> optionsMap = optionMap(blob, entry.getValue());
+      Map<StorageRpc.Option, ?> optionsMap =
+          optionMap(blob.generation(), blob.metageneration(), entry.getValue());
       toUpdate.add(Tuple.<StorageObject, Map<StorageRpc.Option, ?>>of(blob.toPb(), optionsMap));
     }
     List<Tuple<StorageObject, Map<StorageRpc.Option, ?>>> toGet =
         Lists.newArrayListWithCapacity(batchRequest.toGet().size());
-    for (Map.Entry<Blob, BlobSourceOption[]> entry : batchRequest.toGet().entrySet()) {
+    for (Map.Entry<Blob, Iterable<BlobSourceOption>> entry : batchRequest.toGet().entrySet()) {
       Blob blob = entry.getKey();
-      Map<StorageRpc.Option, ?> optionsMap = optionMap(blob, entry.getValue());
+      Map<StorageRpc.Option, ?> optionsMap =
+          optionMap(blob.generation(), blob.metageneration(), entry.getValue());
       toGet.add(Tuple.<StorageObject, Map<StorageRpc.Option, ?>>of(blob.toPb(), optionsMap));
     }
     StorageRpc.BatchResponse response =
diff --git a/src/test/java/com/google/gcloud/storage/SerializationTest.java b/src/test/java/com/google/gcloud/storage/SerializationTest.java
index 7e3cb3e89258..365462d3f69a 100644
--- a/src/test/java/com/google/gcloud/storage/SerializationTest.java
+++ b/src/test/java/com/google/gcloud/storage/SerializationTest.java
@@ -17,9 +17,11 @@
 package com.google.gcloud.storage;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotSame;
 
 import com.google.gcloud.AuthCredentials;
 import com.google.gcloud.RetryParams;
+import com.google.gcloud.storage.Acl.Project.ProjectRole;
 
 import org.junit.Test;
 
@@ -28,9 +30,40 @@
 import java.io.IOException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.Collections;
 
 public class SerializationTest {
 
+  private static final Acl.Domain ACL_DOMAIN = new Acl.Domain("domain");
+  private static final Acl.Group ACL_GROUP = new Acl.Group("group");
+  private static final Acl.Project ACL_PROJECT_ = new Acl.Project(ProjectRole.VIEWERS, "pid");
+  private static final Acl.User ACL_USER = new Acl.User("user");
+  private static final Acl.RawEntity ACL_RAW = new Acl.RawEntity("raw");
+  private static final Blob BLOB = Blob.of("b", "n");
+  private static final Bucket BUCKET = Bucket.of("b");
+  private static final Cors.Origin ORIGIN = Cors.Origin.any();
+  private static final Cors CORS =
+      Cors.builder().maxAgeSeconds(1).origins(Collections.singleton(ORIGIN)).build();
+  private static final BatchRequest BATCH_REQUEST = BatchRequest.builder().delete("B", "N").build();
+  private static final BatchResponse BATCH_RESPONSE = new BatchResponse(
+      Collections.singletonList(new BatchResponse.Result<>(true)),
+      Collections.<BatchResponse.Result<Blob>>emptyList(),
+      Collections.<BatchResponse.Result<Blob>>emptyList());
+  private static final ListResult<Blob> LIST_RESULT =
+      new ListResult<>("c", Collections.singletonList(Blob.of("b", "n")));
+  private static StorageService.BlobListOption BLOB_LIST_OPTIONS =
+      StorageService.BlobListOption.maxResults(100);
+  private static StorageService.BlobSourceOption BLOB_SOURCE_OPTIONS =
+      StorageService.BlobSourceOption.generationMatch(1);
+  private static StorageService.BlobTargetOption BLOB_TARGET_OPTIONS =
+      StorageService.BlobTargetOption.generationMatch();
+  private static StorageService.BucketListOption BUCKET_LIST_OPTIONS =
+      StorageService.BucketListOption.prefix("bla");
+  private static StorageService.BucketSourceOption BUCKET_SOURCE_OPTIONS =
+      StorageService.BucketSourceOption.metagenerationMatch(1);
+  private static StorageService.BucketTargetOption BUCKET_TARGET_OPTIONS =
+      StorageService.BucketTargetOption.metagenerationNotMatch();
 
   @Test
   public void testServiceOptions() throws Exception {
@@ -52,8 +85,18 @@ public void testServiceOptions() throws Exception {
   }
 
   @Test
-  public void testTypes() throws Exception {
-    // todo: implement
+  public void testModelAndRequests() throws Exception {
+    Serializable[] objects = {ACL_DOMAIN, ACL_GROUP, ACL_PROJECT_, ACL_USER, ACL_RAW, BLOB, BUCKET,
+      ORIGIN, CORS, BATCH_REQUEST,BATCH_RESPONSE, LIST_RESULT, BLOB_LIST_OPTIONS,
+        BLOB_SOURCE_OPTIONS, BLOB_TARGET_OPTIONS, BUCKET_LIST_OPTIONS, BUCKET_SOURCE_OPTIONS,
+        BUCKET_TARGET_OPTIONS};
+    for (Serializable obj : objects) {
+      Object copy = serializeAndDeserialize(obj);
+      assertEquals(obj, obj);
+      assertEquals(obj, copy);
+      assertNotSame(obj, copy);
+      assertEquals(copy, copy);
+    }
   }
 
   @SuppressWarnings("unchecked")