Tested and approved, Spare Air is a totally self-contained (3.0 cu.-Feet of air), refillable backup air system that's small and easy to use. It was designed to get you to the surface in the event of an emergency; yet, it is small enough to not even know you are wearing it. |, Easy to travel with, Easy to wear, Easy to refill, Easy to hand off to a fellow diver in trouble.