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Ice stayed solid in this tumbler from my morning coffee all the way through an afternoon at the pool. The insulation genuinely works, and it doesn't sweat on the outside even in direct sun.

Took this on a hike last weekend and the ice was still clinking around hours later. The insulation genuinely holds up, and it hasn't leaked once in my bag.

Filled it with ice water before bed and there was still ice rattling around the next afternoon. The lid seals tight enough that I can toss it in my bag without worrying about leaks.