A large capacity seat bag specifically designed for bikepackers wanting a streamlined way to carry gear without the need for a rear rack. The reinforced, anti-slip/scratch fabric protects the saddle while the advanced mounting system enables convenient and secure mounting to seatpost 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. MATERIAL: Polyethylene / Anti-slip PU leather / Nylon / Engineering grade polymer Lightweight, durable, water repellent and stain resistant  BAG ATTACHMENT: Holster with hook and loop fastener and buckle fastener WATERPROOF RATING: 10,000 mm (waterproof inner bag) MAX LOAD CAPACITY: 5 kg / 11 lb ADDED FEATURES: Waterproof carry bag, Air release purge valve, Attachable rear light strap, Optional BackLoader Wishbone SIZE: 46 x 24 x 22 cm / 18.1†x 9.4†x 8.7†(10 L)  WEIGHT: 508 g / 17.92 oz (10 L)