I’ve been watching a thread in the travel gear forum about Nalgene water bottles. Looking around at some of the alternatives suggested by participants it looks like the Platy Bottle may be the way to go. Benefits include:
Durable enough to freeze or boil
Inexpensive compared to Nalgene bottles
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The Platy Bottle is a part of a modular hydration system, so tubing can be added for use in a hydration pack.