Iron Duck’s classically styled oxygen bags boast a cylindrical clamshell design with dual YKK reverse-coil zippers. The interior has mesh pouches and elasticized tool holders lining the padded walls. A “D” or Jumbo “D” tank is secured with heavy-duty polypro tie-downs. The sling-style, removable shoulder strap has a non-slip rubber pad. No pockets, one pocket or two pockets; “E” Size (no pockets) is also available.