I bought these because I make smoothies in a large jar and I need a case to protect them, for some reason such cases are very hard to find. A friend has the same one, he used it for many years and recommended it to me. So far it's working great! Plus, it definitely keeps the smoothie cold longer. I've also used this with my Nalgenes but to be honest if I want ice cold water I'll just use a stainless steel water bottle so I don't see the point of Nalgene other than being a cute case.
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