Spare Air 600

With 6 cubic feet of breathing gas, you get double the supply of the Spare Air 300 in a package that’s the same length and only 3.25 inches in diameter. Like all Spare Air models, it’s easy to fill from any scuba tank using the included adapter—with no tools needed—and it’s safe to fly with when empty. Includes holster and air-fill adapter.

$389 | spareair.com