At room temperature: poured boiling water, after 12 hours poured out very hot water (burns the hand). Haven't tested it on the street. The neck heats up a little and the lid also, like most thermoses, it is clear that the main heat loss will be through it. The diameter of a liter thermos is too big even for a man's hand, a handle, at least a soft belt one, would not hurt. Unfortunately, there are not many thermoses with a handle on sale. In general - an ordinary thermos.
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