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Filled it with iced water before a hike and there was still ice rattling around six hours later. The insulation genuinely holds up, and it hasn't leaked in my bag once.

Left it in a hot car all afternoon and there was still ice rattling around at dinner. The lid seals tight enough that I can toss it in my bag without worrying about leaks.

Took this on a hike and the ice was still rattling around eight hours later, which I honestly didn't expect. The lid seals tight enough that it didn't leak in my pack, and the outside stayed dry the whole time.