ll be glad to have this 24L dry backpack with an insulation purge valve to keep your liquids cool. Conscientiously assembled with durable polyvinyl waterproof fabric and welded seams. The top of the bag is designed to roll shut and clip securely shut with a nylon buckle to keep contents cold and prevent water from leaking out. Front welded non waterproof pocket. Adjustable backpack straps at the back of the bag are welded to the main vessel, and there’s a steel bottle opener attachment. Cheers! . . . On the beach.