【Material】Made of Neoprene, Non-woven ,Canvas, Cotton. Lining : Polyester. 【Size】Carrying Bag size: Diameter-8.2 inch, Height-21.65 inch, Thickness-0.2 inch, fits 3L air cylinders. 【Application】Protect the carbon fiber tank from scratch, bring it easily and flexibly when you join a PCP game, scuba diving, outdoor hiking. 【Convenience】The tank backpack is easy to carry with an adjustable shoulder strap which can be used over the shoulder. The top of the bag closes with drawstring to protect the items inside, the pocket can put some small objects. 【Easy cleaning】Wash by hand for best result and do not lorn, quick dry.