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I’ve been leaving it in the car for three days straight and the water’s still ice cold — the 20-hour claim undersells it. The 40oz size is perfect for long beach trips, and the lid seals tight enough that I’m not worried about spills.

Took this on a long hiking day and the 40oz capacity meant I didn't have to hunt for a refill until evening. The lid seals tight enough to toss in my bag without a second thought, and that 20-hour cold claim held up surprisingly well through the heat.

Took this on a long bike ride and the 40oz size meant I didn’t have to stop for refills once, which was honestly a game-changer. Ice was still clinking around when I got home hours later, so the 20-hour cold claim feels legit.