We were the first company to introduce a compression dry sack without a purge valve. Air permeable e Vent® fabric on the base allows air to be pushed out of the sack, while stopping water getting in: lighter, simpler and more reliable than a purge valve. The body is made of a tough 70D polyurethane coated Nylon. It has a non-wicking roll-top closure and a lid with four straps for even compression. Specifications. • 10,000mm waterhead, rugged 70D Nylon body and lid. • Double stitched and tape sealed seams. • Non-wicking roll-top closure with lid. • Bar tack reinforced stress points. • White interior for better visibility of contents. • Pull handle on the bottom. • Includes Field Repair Buckle. • Size: 8''x18''. • Weight: 5.2 oz / 148g. • Max/Min: 14L to 4.5L.