At Adventure Lion, we craft our products from the finest materials available. Light and versatile, our dry bags are state of the art, Pure Grade Y7 .5mm thick 500D (Denier Density) waterproof polymer. These bags will survive a lifetime of adventure. This material is designed to be sturdy enough to help prevent abrasions, punctures, tears, and whatever else Mother Nature can throw at it. However, we do not believe in trading flexibility for durability. Even in the most frigid temperatures, these bags will remain pliable.