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Filled it with ice water before a 9am meeting and there were still cubes clinking around at 4pm. The lid seals tight enough that it hasn't leaked in my bag once.

Took this on a full day hike and my water was still ice cold by the time I got back to the car. The lid seals tight enough that it didn't leak a drop in my backpack. Honestly better than the tumbler I used for years.

Ice stayed in it all day at the lake last weekend, even sitting in direct sun. The lid seals tight enough that I can toss it in my bag without worrying. Honestly better than the cup I used for years.