Can You Heat Your Yeti Drink Tumbler Over A Campfire? - Tasting Table
Briefly

Yeti drinkware's exceptional design means it keeps drinks at their intended temperatures for hours, but direct exposure to fire can ruin both your beverage and the tumbler.
The silicone layer on Yeti tumblers cannot withstand the extreme heat of campfires, with a melting point around 400°F, while flames can reach 900°F.
Even without the silicone, using fire to heat Yeti drinkware is ineffective due to its construction that is designed to minimize heat transfer.
Yeti's premium drinkware features advanced vacuum insulation that makes it a top choice for maintaining drink temperatures, but it is not suitable for heating.
Read at Tasting Table
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