Ferno's Oxygen Carry Bags feature a single piece design with a squared aluminum frame so it does not roll to one side. The bags are padded for protection and can hang from a cot. Durable DuPont® Cordura® construction with YKK® zippers. Structural foam is dual-density Plastizote® foam for the highest quality and longer life. Double-zip opening for easy access to regulator. Holds an “E” size cylinder.