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Your question contains a strawman argument - that you must always fill a large water bottle. Obviously you don't - you can always ½ fill it, and so only have ½ of the weight to carry. Of course, it...
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Your question contains a strawman argument - that you must always fill a large water bottle. Obviously you don't - you can always ½ fill it, and so only have ½ of the weight to carry. Of course, it...