Description of Outdoor Research Zip Sack #4 Zipper access makes it easy to grab a fresh pair of socks or a warm hat without unloading your pack in the middle of the trail. Features: Dimensions: 12 x 7 x 6 (inches); 31 x 18 x 15 (centimeters) Volume: 504 (CU. in.); 8.3 (liters) Weight: 1.9 oz. 54g Ripstop nylon main body Ripstop siliconized nylon sidewalls Water-resistant top zipper Webbing side handles Bound seams for durability