The Avelo diving system is a single cylinder, back-mounted scuba set with variable density buoyancy control. The gas cylinder is a carbon fibre over aluminium liner filament wound pressure vessel with a charging pressure of 300 bar and a gas capacity of about 106 cubic feet of atmospheric pressure air or recreational nitrox. The fully charged set is slightly buoyant and lighter than the equivalent scuba set using a metal cylinder and inflatable buoyancy compensator. Buoyancy of the set is adjustable by injecting ambient water into the cylinder to increase density and releasing it to reduce density. Less ballast weight is needed by the diver.[1][2][3]