small size oxygen can 1.high purity,portable,green,pure,safe. 2.Small,big-capacity,easy to carry, ... mind.Proper ways of using small size oxygen can :1.take off the cover and mask from the bottle. 2.with the ... using, cover the cover.Structure of the small size oxygen can :Flavor: mint and grapefruit.* OEM is welcome. portable small size oxygen can 10000ml