Our line of heavy duty dry bags are custom made to our specifications. These bags are constructed from a new special PVC fabric with 22oz. 1000 deiner sides and 40oz. 3000 deiner bottoms. The XL and L also feature heavy duty padded backpack straps, padded grab handle and a special top seal that has a extra large overlap closure. The Large size is 40" tall x 17" diameter and has awhopping 8500cubic inch capacity.