These diving lift bags are available in four different sizes (60/70/125/140LBS) and are designed for cave, wreck diving or when conducting a salvage operation. These lifting bags for sale can rapidly remove air when needed and eliminate accidental over-inflation during ascent from expansion. They come attached with a pull string lanyard. The scuba lifting bags are easy to assemble and convenient to use.
The 60/70/125/140LBS Diving Lift Bags is the yin, to your yang. You've found what you're looking for.