If you don't want to store your oxygen cylinder inside of our Modular Backpack then this is the perfect accompaniment to your medical system, the Modular Barrel Bag.
 
Made from the same waterproof material, and zips, as our main Modular Backpack this barrel bag is perfectly designed to fit all ZA, CD, and D size cylinders, or those of a similar size! Inside the cylinder is securely held down by two buckles, and along each side are nets which can hold a variety of masks or airway adjuncts.