Yeti water bottles

Not easily. The only place heat can get in on a double wall bottle is the lid. Good luck heating an upside bottle without melting your lid.
 
before i purchased mine, I called and asked. they highly advised against it!

Because double wall bottles and cups are insulated. They are vacuum sealed. Heating them up will cause them to explode. It amazes me that people don't get that sometimes.
 
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