Another breed in Oxy resus back packs. The D175 Oxy resus two is a rigid wall bag made from heavy duty cordura material. Its outer wall construction and shape makes it ideal to be stowed into vehicles or stored in lockers. The Oxy resus 2 stores a C size cylinder into an oxygen sleeve. There are numerous pockets and elastic loops to store oxygen masks, tubing, suction hoses, airways, etc.