I have a yeti tumbler and it is great, easily worth the cost. Hot coffee all morning. Cold drinks for hours.
It isn't what I would consider a thermos though as the lid doesn't seal and is not insulated. For that you would have to get what they call a 36 oz bottle with "cup cap". I haven't tried one but I am sure they would work well.
Stanley is probably as good of a thermos and cheaper though.
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