Description: - This Waterproof bag is made of PC polyester, super waterproof, which well protects your gear and tools. - The backpack features the built-in detachable waterproof bag, so its waterproof performance is more excellent. - Multiple Purposes: A large zipper on the outside for quick grab and with the backpack, keys, phone and other required item can be easily stored. - Large Capacity, features 4 ring or band, which can be tied to the bicycle racks, or on the aluminum alloy box of motorcycle and so on. - Great for all outdoor activities, including motorcycle riders, boating, rafting, fishing, camping and hiking.Specification: - Name: Waterproof Backpack - Material: PC polyester - Zipper: Nylon rubber teeth + Zinc alloy slider - S: - Size: 20 x 12 x 30cm/7.87 x 4.72 x 11.81 inch - Capacity: 10L - M: - 25 x 20 x 38cm/9.84 x 7.87 x14.96 inch - Capacity: 20L - L: 32 x 25 x 43cm/12.60 x 9.84 x 16.93 - Capacity: 30L - Features: Super WaterproofPackage Includes:1 x Motorcycle Tail BackpackNote:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.