The oxygen tank backpack fits for size M15(D)、M22(JD). O2 carrier for oxygen users.
The D oxygen cylinder backpack has 6 holes placement for the oxygen tubing to come out conveniently.
The hook and loop fasteners, hard plastic base inside and 4 rubber feet on the bottom of the m15 oxygen carrier bag holds your d cylinder in place.
2 zippered pouches on the front of the D oxygen backpack are enough for the small equipment.
Nice padding on the back of the d size oxygen tank bag protects your d oxygen tank, with chest straps, the waterproof o2 bag backpack is easy to adjust for tighter and looser.