The Therm-A-Rest Waterproof Stuff Sack is a rugged, all-weather stuff sack designed to protect your mattress from weather, dirt, and stains. A roll down closure and taped seams ensure your mattress stays dry. The Waterproof Stuff Sack is made from 210-denier coated nylon that stands up to the toughest of conditions. A handy D-ring and end handle make sacks easy to secure and unpack. The Thermarest Waterproof Stuff Sack is also great for storing ammo, dry clothes, and other hunting essentials.