Crazy Genie Portable Backpack Bag Rain Cover Shoulder Bag Waterproof Cover Outdoor Climbing Hiking Travel Bicycle Kit Material: Waterproof Polyester Size S: Suit For 30L-45L Size L: Suit For 50L-80L Can be free folded in the sachet,it is portable convenient and ultra-light weight. Specially reinforced, keep your backpack and belongings dry from rain, mud and dust.