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Took this on a weekend hike and my water was still cold hours later, which genuinely surprised me. The insulation really does what it claims, and it fits my car's cup holder without wobbling.

Bought this mainly for my desk at work and the ice actually lasted through a full eight-hour shift, which surprised me. The lid seals tight enough that I can toss it in my bag without worrying.

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