The Onyx M-16 Belt Pack&';s unique design keeps stand-up paddleboarders, anglers, boaters, and other paddlers safe without compromising movement! Lightweight and low-profile; weighs less than 1 lb. Manual inflation 16 gram CO2 charge provides 17 lbs of buoyancy. 26.5 lbs of buoyancy when fully inflated D-ring attachment for small accessories U.S. Coast Guard Approved Size: Adult Universal - Fits 30"-52" chest. For persons 16 years and older, and over 80 lbs Requires secondary donning NOT recommended for weak or non-swimmers