Review on Anti-Slip Silicone Sleeve for Summit and Ascent Bottles - Fits 10oz, 14oz, 17oz, 18oz, 20oz, 22oz & 24oz Water Bottles - Simple Modern Boot - Midnight Black (Small) by Lonnie Batch

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.