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Ice water stayed cold in a hot car all afternoon, which honestly surprised me for a tumbler this size. The insulation really holds up, and the lid seals tight enough that I can toss it in my bag without worrying.

Filled it with ice water before a hike and there was still ice rattling around six hours later. The lid seals tight enough that it hasn't leaked in my bag yet.

The insulation actually holds up — my tea was still warm four hours into a chilly soccer game. It fits my car cup holder too, which my old tumbler never did.