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I've been using this tumbler for my iced coffee during commutes, and it keeps everything cold for hours

Took this on a three-hour hike in 90-degree heat and the ice was still clinking around when I got back to the car. The lid seals tight enough that it didn't leak a drop in my pack, which honestly surprised me.

The insulation is no joke — I filled it with cold water before a hike and there was still ice rattling around six hours later. It fits my car's cupholder too, which my last tumbler never did.