We ordered these bottles for our kids to bring to school. I was impressed that the inside cap was also stainless steel. However the threads on the cap and bottle are difficult to match. There is a lot of friction between the cap and bottle where the stainless steel parts thread together. This friction makes it difficult to thread and even more difficult to remove the cap once it has been tightened. I would not suggest this item for any age person. I'm going to try the Nathan flip tops.
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