Have you found an anchor and need to recover it? Maybe you're a part-time salvage diver or underwater archaeologists, or anyone who needs to recover a heavy underwater object will appreciate the design of our lift bag. Its trapezoidal shape means more air at the top, creating a shorter, lower profile bag that is ideal for inflation inside tight spaces. Intended for lifting heavy objects over 10lbs, some our LiftBags contain an internal dump valve with pull cord that is used by the diver ascending with the bag to control ascent rate. Open design means air will vent out the bottom in case of a rapid ascent in an emergency.