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I expect it's a camp tap. You fill it with water, hang it somewhere by the handle, and can get a little water from the wine-box like valve on it. It doesn't take up space when it's empty, unlike a bottle, and you don't need two hands to operate it, are less likely to overpour or spill, etc. Here's one of the water storage bags REI sells these days:


After you pack clothing into it , it can be evacuated through the valve to compress the clothing to the smallest volume.

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