The OP says a Nalgene Cantene bottle. That's NOT what we all commonly think of as a Nalgene bottle, but is more like a Platypus. See photo below. Here's a link:
Nalgene 'cantene' bottle
For myself, I leave NO AIR (or very little) in my regular hard plastic Nalgene bottle when doing this. It is air that expands and contracts, not water, when it cools or heats. I want to get rid of that pressure/suction buildup.
I've not had a leak ... so far. But also I do NOT tighten the cap too hard. To me the cap is the 'weakest link.' I have screwed caps on other bottles so tight that the cap cracks. Not good. So, I don't 'He Man' it, as I think that would cause the very leak problem I want to prevent.
And no, wrapping a sock or t-shirt doesn't keep you from getting heat, but it does keep you from getting scalded.
Rain Man
P.S. A Google search turns up another 'Nalgene' bottle that looks like an old Army canteen. Not sure if that could be what the OP is talking about.
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