Keeps water cold

I filled this with water and took it with me to watch the Chargers and Saints practice. I was outside on a very warm day for at least 3.5 hours, plus travel time. The water was still cold when I got home. And that is without any ice. I've only used the bottle a couple of times, so I can't attest to the durability, but it certainly does what I need it to do.

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