Sigg explicitly warns against boiling water in their stainless water bottles, but I'm not sure if this is because the direct heat would damage the finish/graphics on the bottle, or if it would compromise the integrity of the bottle itself. It might be worth experimenting with/clarifying with Sigg before you get out into the woods.
Hmm. It may have to do with the coating they put on the inside of the bottle to prevent leaching. OK, the regular Sigg bottle is out as something to heat in although the .6L flask with steel cup is still an option.
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