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Ice actually stayed solid in this thing from my morning commute until well past lunch, which never happens with my old tumbler. The lid seals tight enough that it hasn't leaked once in my bag.

Brought it on a three-hour hike and my water was still ice cold when I got back to the car. The insulation genuinely works, and it didn't sweat at all in my bag.

Took this to the lake and my drink was still cold six hours later, which honestly surprised me for something this size. The insulation really does what it claims, and the lid seals tight enough that I didn't worry about leaks in my bag.