Maximum Size of Cylinders: Twin 20 liter or Single 20 liter. Maximum Buoyancy: 190 Newtons / 45 Lbs. Improper maintenance, use or misuse of this BC could result in serious injury or death. Improper maintenance, use or misuse of this BC could cause loss of buoyancy control and exposure to other hazards, including uncontrolled descents and uncontrolled rapid ascents, resulting in drowning, decompression sickness, air embolism, stroke, seizure.