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Ice stayed solid in this thing from morning until I refilled it after dinner, which I did not expect from a tumbler. The lid seals tight enough that I've been tossing it in my bag without worrying about leaks.

Took this on a hike last weekend and the ice was still rattling around six hours later. The lid seals tight enough that it didn't leak in my backpack either.

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