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Took it on a hike last weekend and my water was still icy hours later, which never happens with my old tumbler. The lid seals tight enough that I could toss it in my backpack without a single leak.

Ice stayed solid in this thing from morning until well past dinner, which honestly surprised me for something this size. The insulation is no joke, and it doesn't sweat all over my desk either.

Took this to the lake last weekend and ice was still rattling around after six hours in the sun. The lid screws on tight enough that it didn't leak once in my bag.