Original USGI M40 series Protective Mask Carrying Case. It is made of heavy-duty Cordora nylon. Velcro closing. This bag has straps that can be configured to carry in multiple positions. Over the shoulder, around the waist strap or attached to a belt with the hooks and used with the leg strap. Measurements: 10 1/2" x 8 1/2" x 4 1/2". Great item for airsoft and paintball warriors as an ammo bag because of the ease and speed in opening/closing.