this post was submitted on 12 Mar 2026
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Think you said it best in your post - you need a Thermos.
As in an actual "Thermos" branded one.
I got one of their pint sized food flasks with a folding spoon and screw on cup/lid cover that's so efficient I've got to make my coffee the night before if I want to drink it in the morning, or add cold water if I forget, otherwise it's only cool enough to drink about 12h later.
Those old vintage ones can keep coffee at boiling temperature for most of a work day.
Even the newer fully metal ones are solid (pun definitely intended)
I just looked up the food flask design and I quite like that.