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I've been using this tumbler for my morning coffee and it stays hot for over four hours, which is exactly what I needed. The lid seals tightly so no spills in my bag.

Took this on a hike last weekend and the ice was still rattling around eight hours later. The lid seals tight enough that it didn't leak a drop in my backpack, which honestly surprised me.

Filled it with ice water before a morning hike and there was still ice rattling around when I got back five hours later. The insulation is no joke, and it hasn't leaked once in my bag.