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Filled it with coffee at 7am and it was still hot at lunch, which I did not expect from a tumbler this size. The lid seals tight enough that I can toss it in my bag without worrying about leaks.

The lid seals tight enough that I can toss it in my bag without worrying about leaks, which is why it's become my office tumbler. Only gripe is that it's a bit top-heavy once it's full, so I've knocked it over more than once.