IPX7 Waterproof Bag Roll Top Sack Backpack for Trekking Swimming Rafting. FLOATABLE MATERIAL: The bag backpack made of high quality waterproof fabric, IPX7 waterproof, durable, tear proof. LARGE CAPACITY: Side storage pocket, buckle strap for hanging outdoor items. Adjustable straps provide two ways to wear it: double shoulders/single shoulders. EASY TO USE: Just put your gear in the backpack, then grab the top and roll down tightly 3 to 5 times and then connect the buckle to complete seal. EASY TO CARRY: Lightweight design, convenient travel, Comfortable and breathable, The waterproof bag can be folded into small sizes WIDELY USED: Suitable for floating, diving, kayaking, boating, sailing, canoeing, surfing, fishing, rowing, rafting, hiking, camping, climbing, beach activities, etc. 20L: Flat Height: 60cm/23.62inch, Roll Down: 46cm/18.11inch, Width: 35.5cm/13.98inch 30L: Flat Height: 69cm/27.17inch, Roll Down: 54cm/21.26inch, Width: 36cm/14.17inch. 1 Piece Waterproof Backpack. Please allow slightly error due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Wish you a wonderful online shopping! People always bought together with.