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: 1,220 cu. in. / 20L. Measures: 19H X 10W X 6D in.. Weight: 0.11 lbs.. Spot clean. Imported.