Aquafree Ultra Light Dry Bag is made of Siliconized Cordura, which is one of the lightest and toughest waterproof nylon fabrics available, combines with a watertight roll top closure and taped seams to keep water out (not intended for full submersion). Designed for backpacking, kayaking, camping, hiking, canoeing, boating, rafting, or adventure travel How to use? (1) Grip and roll the top 3 times (2) Buckle Polyurethane coated and fully seam sealed