My boys took them to day camp every day for almost 6 weeks and they have held up very well. They don't flow at all! They are also cute and easy to open. Two little things they can do better. 1. If they were double walled/insulated to keep the water colder longer. 2. If the straw in the lid they drink from could be taken apart for cleaning. We only use water in it, so the lid/straw can be rinsed and dried well to avoid problems. I wouldn't pour milk or sugary drinks in it as they are difficult to clean and could get moldy.
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