I use these for project bags. It can be worn on your wrist for on-the-go crocheting or knitting, (haven’t we all done this at one time or other, oftentimes holding the skein under the arm as you walk)?
It also corrals those pesky yarn balls, that otherwise would be rolling haphazardly all over the floor as you work from them.
Confidentially, I have never used my shower caddy for it's intended purpose. Even if I wanted to, it's always full of yarn.