I would be very afraid of these bottles rupturing sooner or later. The consequences of a rupture may not be pretty, as in severe burns.
I just went with a nagelene bottle as it seems to be tried and true and without cause to rupture.... a leak is one thing but a rupture can be nasty painful and if your miles and miles from medical help it could be a very long painful ordeal.
I would suggest that you never use water hotter than what can be tolerated without burning your skin with that bottle style.
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