The ALPS Dry Compression Stuff Sack is a compression stuff sack that features Air Control. Air control is a waterproof air permeable fabric, which allows you to compress the air out and doesn't let water in. This high-tech fabric gives you the ability to compress the contents while maintaining its waterproof integrity fully. The Dry Sack is the perfect compression stuff sack for wet environments (not submersible). FeaturesWaterproof compression stuff sackAir control bottom fabric allows air to be pushed out70D nylon ripstop sides with waterproof coatingWaterproof taped seamsBottom handleBartacked stress pointsStrong and durable nylon webbing