The Topeak Backloader 15L Saddle Bag is a large capacity bag specially designed for cyclists that provides a streamlined way to carry gear without the need for a rear rack.Constructed of lightweight, highly water-resistant and durable materials, it mounts and removes quickly.An easy access waterproof inner bag is included to keep contents completely dry.Characteristic:.- Easily mounts to saddle rails and seat post with velcro straps.- Roll-top closure.- Included waterproof inner bag keeps contents dry and easy to access.- Built-in air release button keeps the waterproof inner bag compact.