The Buoyancy Control Device is the centerpiece of your scuba diving gear, and is made up of bladder, pockets, exhaust valves, power inflator and an integrated weight system. No piece of dive gear needs to multi-task more than a Buoyancy Control Device. It has to secure tank, hoses and accessories. Most supply an integrated-weight-ditch system and roomy cargo pockets while maintaining a streamlined profile. It has to enable you to safely control your ascents and descents, and afford relatively comfortable surface flotation. and along with holding the tank it also secures hoses and accessories.