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For 1.2 ounces, one can carry a one liter (33.8 ounces) capacity Platypus Bottle. For 5.5 ounces, you can have a hard-sided one liter Nalgene bottle, the icon of heavyweight backpacking.
And for a seemingly inconsequential premium of 7.3 ounces, you can have a water bottle that ... interacts with you?
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