Verified Buyer Reviewed by nilejam from Naches, WA on Thursday, July 6, 2017
I bought two of the 25 oz and two of the 21 oz. The first one I opened leaked slightly when squeezed, but none of the others did. STP replaced it immediately. So far I have taken them to work, on bike rides, and on a hike. They work well, do not leak, and keep drinks colder than regular bottles by a bit. We'll see how they hold up by the end of summer. A quick wash and they did not taste of plastic.