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 rails. Easy access waterproof carry bag and built-in air release purge valve keeps bag compact and dry while you re on your next adventure. Quick Holster Attachment - Install / remove waterproof carry bag quickly and easilyBuilt In Air Release Valve - Built-in Air Release Purge Valve in the waterproof carry bag purges extra air to fully compress the load.Night Time Safety Easily attach rear light to the strap for night time safetyOptional Anti-Sway Backloader Wishbone - Keeps riding balanced and hold 2 additional bottle cages for extra hydration needs SOLD SEPERATELY