The Alps Dry Sack Medium features a new concept in waterproof storage, the Air Control Bottom. Along with the 70D nylon ripstop 3000mm coated sides, the bag has a waterproof/breathable bottom. This allows you to stuff the bag, roll down the top and secure it with the attached side release buckle and then compress it with the side compression straps. As you compress it, air is allowed to escape through the bottom waterproof/breathable material, making compression extremely easy. The bag is waterproof but it is not meant to be completely submerged. Size: 9" x 20" Weight: 5.8 oz. Import Waterproof compression stuff sack Air Control Bottom fabric allows air to be pushed out 70D Nylon Ripstop sides with a 3000mm waterproof coating Side compression straps with ladder locks Roll top closure secures with a side release buckle Waterproof taped seams Bottom handle Bartacked stress points Size: 9" x 20" Weight: 5.8 oz. Import