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Left it in a hot car for three hours and my iced coffee still had ice rattling around when I got back. The lid seals tight enough that it hasn't leaked in my bag yet either.

Left hot coffee in this thing all morning and it was still steaming at lunch. The insulation is no joke, and it hasn't leaked once in my bag on the commute.

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 yet, which was my main worry.