What you're thinking about, of course, is not the same thingcondensation is what you have in mind. And in theory it's quite possible. If you have a bladder full of cold water, warm, moist air from around you will inevitably cause some condensation, or "sweating." Enough to be a problem? Not likely. Besides, most bladder makers sell an insulated bag that the bladder fits into. Cascade Designs makes a product called a Hydration Insulator, which does exactly that: $18, and no sweat
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