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The lid screws on tight enough that I can toss this in my bag without worrying about leaks. My coffee was still hot when I got to my desk an hour after leaving the house.

Keeps drinks warm for a couple hours, which is fine for my short commute, but it didn't stay hot nearly as long as I hoped on a cold morning. The tumbler feels solid and the lid seals well, though it's a bit heavier than my old one.