These straps will fit snugly around the top of many of your Skull Smash product bottles, and have a carabiner at the other end so that you can attach it to a number of items to always know where your bottle is in your bag, at a meet, or while traveling. They do fit most of our regular size and large size bottles, but will not fit our oversize or smaller sized neck bottles. They are meant to be snug, so removing them often may cause the rubber to wear down and tear.