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Old 01-25-2021, 11:25 PM   #6
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stripperguy's Avatar
Join Date: Sep 2006
Location: Schenectady, NY
Posts: 3,826
I do quite a bit of back country skiing (AT gear) and faced the same issue years ago.
I abandoned the bladder and tube due to the freeze up issues.
Best to keep your water inside your jacket, if the temps are low and your day is long.
If you know your heat transfer theory, you know that you can't avoid losing heat for hours on end. There are laws!
Most winter activity does have a convenient, relaible heat source though...
I'm surprised that no commercial manufacturers make a jacket with an internal bladder and supply tube.
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