diff --git a/rackspace/blockstorage/v1/volumes/delegate.go b/rackspace/blockstorage/v1/volumes/delegate.go
index a0b2380..4f14454 100644
--- a/rackspace/blockstorage/v1/volumes/delegate.go
+++ b/rackspace/blockstorage/v1/volumes/delegate.go
@@ -1,11 +1,25 @@
 package volumes
 
 import (
+	"fmt"
+
 	"github.com/rackspace/gophercloud"
 	os "github.com/rackspace/gophercloud/openstack/blockstorage/v1/volumes"
 	"github.com/rackspace/gophercloud/pagination"
 )
 
+type CreateOpts struct {
+	os.CreateOpts
+}
+
+func (opts CreateOpts) ToVolumeCreateMap() (map[string]interface{}, error) {
+	if opts.Size < 75 || opts.Size > 1024 {
+		return nil, fmt.Errorf("Size field must be between 75 and 1024")
+	}
+
+	return opts.CreateOpts.ToVolumeCreateMap()
+}
+
 // Create will create a new Volume based on the values in CreateOpts. To extract
 // the Volume object from the response, call the Extract method on the
 // CreateResult.
diff --git a/rackspace/blockstorage/v1/volumes/delegate_test.go b/rackspace/blockstorage/v1/volumes/delegate_test.go
index 3c50d21..56b86bd 100644
--- a/rackspace/blockstorage/v1/volumes/delegate_test.go
+++ b/rackspace/blockstorage/v1/volumes/delegate_test.go
@@ -65,14 +65,25 @@
 
 	os.MockCreateResponse(t)
 
-	options := os.CreateOpts{Size: 4}
-	n, err := Create(fake.ServiceClient(), options).Extract()
+	n, err := Create(fake.ServiceClient(), CreateOpts{os.CreateOpts{Size: 40}}).Extract()
 	th.AssertNoErr(t, err)
 
 	th.AssertEquals(t, n.Size, 4)
 	th.AssertEquals(t, n.ID, "d32019d3-bc6e-4319-9c1d-6722fc136a22")
 }
 
+func TestSizeRange(t *testing.T) {
+	_, err := Create(fake.ServiceClient(), CreateOpts{os.CreateOpts{Size: 1}}).Extract()
+	if err == nil {
+		t.Fatalf("Expected error, got none")
+	}
+
+	_, err = Create(fake.ServiceClient(), CreateOpts{os.CreateOpts{Size: 2000}}).Extract()
+	if err == nil {
+		t.Fatalf("Expected error, got none")
+	}
+}
+
 func TestDelete(t *testing.T) {
 	th.SetupHTTP()
 	defer th.TeardownHTTP()