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Took this to the beach and my drink still had ice in it six hours later, which honestly surprised me for a tumbler this size. The lid seals tight enough that it didn't leak in my bag on the walk back either.

Filled it with ice water before a hike and five hours later there was still ice clinking around in there. The lid seals tight enough that it didn't leak a drop in my backpack, which is more than I can say for my old tumbler.

Took it out on the boat all afternoon and the ice barely melted, even in direct sun. The lid seals tight enough that I don't worry about it tipping over in my bag. Genuinely impressed with how long it holds temperature.