This bottle is very close to a five star bottle. It's the one you're drinking from, and I mean, it doesn't have a vent. Most bottles have a drinking hole and then some sort of vent to allow water to flow into the mouth. It has no vent so the water flows unevenly. Drinking from this bottle is a bit annoying. You get used to it, but it's strange that this feature is missing. When I saw that it keeps water cold, I meant that it keeps water at room temperature at the temperature it was poured in for several hours. If you add ice I wouldn't be surprised if it stays cold all day. Even without the vent I recommend this bottle. It is great.
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