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Two hours into my shift and my coffee was still properly hot, which never happens with my old mug. The lid seals tight enough that I can toss it in my bag without worrying about leaks.

I've been using this tumbler every morning for about three weeks now and my coffee is still warm by the time I get to my desk. The insulation actually holds up, unlike the cheap ones I've tried before. Easy to clean too, which matters more than I expected.