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The lid seals tightly enough that I can toss it in my bag without leaks, and the double-wall insulation keeps my coffee hot for well over four hours.

Took this on a weekend hike and the insulation actually held up — ice was still clinking around after six hours in direct sun. The lid seals tight enough that it didn't leak in my pack either, which I've had problems with before.

Keeps my coffee hot through a whole morning of meetings, which is exactly what I needed. Only gripe is it's a bit heavier than my old tumbler, so it's not the one I grab for walks.