Wickelfisch swim bags are waterproof and made of lightweight, durable ripstop nylon. The bags have a fold seal system and a carrying strap designed for easy operation. Simply place your belongings inside the waterproof bag, roll up the tail seven times leaving air inside the bag, strap on the bag and go for a swim. Since the bag floats, it is also useful when swimming, tubing, paddle boarding, kayaking, canoeing, boating, and wakeboarding.