This features one-half inch of high density, closed cell foam that helps protect the oxygen regulator. It is large enough for your cylinder and attached regulator. There is a pocket on the side for a mask, nasal cannula, etc. There are elastic loops inside the pocket for seven oral airways. There is also a shoulder carrying strap that includes hook and loop straps which attach to a cot rail. Made of heavy Cordura® nylon, it has 3M™ heat applied silver reflective trim to minimize contamination. There are models available for “C”, “D” and “E” cylinders. The Cordura® nylon bag is available in orange or green and weighs 16 oz. The vinyl bag is constructed of 18 oz. orange vinyl and weighs 27 oz. The overall dimension are: #250: 23 1/4”L x 4 1/4” diameter (body) 7 1/2” diameter (head) #251: 35”L x 4 3/4” diameter (body) 7 1/2” diameter (head)