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It fits! But then it slips! & it does its job. My 32 oz flask is safe! Until I pick it up the wrong way & cup falls off. So not only does the cup cover part of the beautiful Iron Flask logo, it has no real grip to the bottle. I’ve already almost lost it three different times.
I really like the concept, but the execution is lacking. The silicone base makes my bottle wobble- not much, but enough to make me uncomfortable with an open lid. Also, the non-slip aspect makes it really hard to put it in my car cup holder - that was a deal breaker.