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True, but in a 25 liter keg I may have stored up to two kg of stuff (2 liters loss of displacement). This is hardly significant. With two of those barrels I still have enough bouyancy left to meet safety requirements. I can’t imagine storing 25 liters of water (or the equivalent weight) in those 25 liter kegs.

Some examples: My camera weighs 400 grams. My sleeping bag is about 1,25 kg.