The Survivor Dry Tourer Tail Bag is a great option if you need a lot of space. It includes the SVT-250 Survivor Dry Roll Bag that can also be mounted separately.; Electronically heat welded at seams making this bag 100% waterproof. Air tight roll closure ensures no water enters the bag Made from waterproof and durable tarpaulin PVC Includes a SVT-250 Survivor Dry Roll Bag Can be mounted to sit on a motorcycle luggage rack or passenger seat Compression straps easily adjust to volume of content Firm internal base plate helps support bag Attaches using the unique "Full-Nelson" mounting system Coated outer material prevents slipping or marking Hi-Visibility reflective accents Lifetime manufacturer warranty Roll Bag Compartment Measures: 16" L x 10" W x 8" H (20.98 liter capacity) Main Compartment Measures: 16" L x 10" W x 18" H (47 liter capacity) Dimensions for both bags (exterior): 16" L x 10" W x 26" H