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Left this in a hot car for three hours and the water was still cold when I got back. The insulation really does what it claims.

Filled it with ice 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.

The lid seals tight enough that I can toss it in my bag without worrying about leaks. Kept my coffee hot through a four-hour drive, still steaming when I got there.