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Ice stayed solid in this thing from my morning coffee until well past lunch, which honestly surprised me for a standard-size tumbler. The insulated walls don't sweat at all, so no wet rings on my desk.

Ice stayed solid in this thing all day at the beach, which I honestly didn't expect from a standard size. The lid seals tight enough that it didn't leak in my bag either.

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