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I do not understand the utility or purpose of this poll. There are far too many variables to the amount of weight carried if you disregard items such as regs, computers, backup gauges, fins, body type and body fat, boots, proficiency, experience, etc. The total amount of negative buoyant weight requirements, relative to the positive buoyant factors at the SS with 500 psi in the tank, are specific to an individual diver.