Features:

• A low pressure direct feed that transports gas from diving cylinder and diving regulator to the BC.
• An inflation valve that allows gas from the direct feed into the bladders of the BC.
• A vent valve that allows gas to escape from the bladders of the BC. Most BCs have at least two vents: one at the extreme top and the other at the bottom of the BC. As air migrates to whichever part of the BC is uppermost, the vent situated at the shoulder is used when upright and the vent situated at the diver's waist is used when inverted.
• An over pressurization valve that automatically vents the bladders if the diver over inflates the BC by ascending or by injecting too much gas.
• A harness that the diver wears with straps around the torso and over the shoulders
• A plastic or metal backplate to support diving cylinders
• Pockets for carrying diving reel, buoys and decompression tables
• An integrated diving weighting system - pockets for lead weights with a quick release mechanism. Integrated weights can eliminate the need for a separate weight belt.
• D rings or other anchor points, for clipping on other equipment such as torches, strobes, reels, cameras and stage cylinders
• Emergency inflation cylinders. This can either be a 0.5 litre air cylinder, filled from the diver main cylinder, or a small carbon dioxide cylinder. There is a risk that an emergency cylinder is accidentally opened during a dive causing a rapid ascent and barotrauma to the diver. Carbon dioxide, being poisonous at high partial pressures, is a dangerous gas to have in a BC because the diver may inhale it from the bag underwater.