The Backloader X from Topeak has a large capacity and is designed for bike packers who want and quick and easy to use streamlined saddle pack that doesn t require a pannier rack. Ideal for carrying all the gear you need to keep dry thanks to the waterproof easy access carry bag.Material: Polyethylene / Anti-slip PU leather / Nylon / Engineering grade polymer Lightweight, durable, water repellent and stain resistantBag Attachment: Holster with hook and loop fastener and buckle fastener Waterproof Rating: 10,000 mm (waterproof inner bag) Max Load Capacity: 5kg / 11lb Added Features: Waterproof carry bag, Air release purge valve, Attachable rear light strap, Optional BackLoader Wishbone Size: 46 x 24 x 22cm / 18.1 x 9.4 x 8.7 (10L) / 51 x 24 x 22cm / 20.1 x 9.4 x 8.7 (15 L)Weight: 508 g / 17.92oz (10L) / 525 g / 18.52oz (15L)The reinforced, anti-slip/scratch fabric protects the saddle while the advanced mounting system enables convenient and secure mounting to seat post and saddle r