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Put a garbage bag in the pack, with the open top of the garbage bag sticking out of the pack. Pour water into the garbage bag one liter at a time, keep track of how many liters of water you use....
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Put a garbage bag in the pack, with the open top of the garbage bag sticking out of the pack. Pour water into the garbage bag one liter at a time, keep track of how many liters of water you use....