Designed to keep the contents of your pack organized and bone dry, Osprey???s Dry Sacks provide the security of waterproof gear storage and color-coded organization in your pack.. . Fabric: 40D Nylon Ripstop. Roll-top waterproof closure. Waterproof coated fabric and seams. Rectangular shape for efficient packing. Capacity: 1,831 cu. in. / 30L. Measures: 20H X 11W X 6D in.. Weight: 0.13 lbs.. Spot clean. Imported.