
If you're a student taking a bottle to class or the library, this is a useful addition. I always hit the hard desks on campus with the bottom of my bottle and it made a very loud noise that distracted my classmates. This probably annoyed me more than she did, but it does what I wanted. It also gives my bottle a grip so it doesn't slide around on my desk or tip over easily. I love it, but it's almost impossible to fit in the drinks compartment on the side of the backpack. Sometimes I have to take it off so I can easily slide into the bottle.

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