iguerburn oxygen tank backpack portable oxygen cylinder carrying carrier bag medical o2 tank holder for size m2, a/m4, ml6, b/m6, m7, c/m9 (do not fit"d" tanks)-black iguerburn are you or someone you love struggling with how to carry an oxygen tank? good solution - iguerburn o2 backpacks are designed to carry portable oxygen bottle. the fabric is sturdy and durable, it is a well-designed product on portable oxygen supply. it has several holes and the o2 line will come out from the side and the top without kinking. the backpack straps are adjustable and padded. they distribute the weight much better for those with back and shoulder issues. this is a wonderful way to use your oxygen cylinder. the extended straps can be buckled so that the straps will not loosen, enjoy having free hands. ideal for your daily travel, work, shopping, and other activities.