Well, here is a random collection. If you have a spare nylon bag lying around, dont throw it away. As a photographer there is plenty you can do with it.
Ok, I am just kidding, you can throw that bag away. Hopefully, you have a recycling thing for nylon bags. That said, this random collection of photography uses for bags is kinda interesting. I would personally not use any of them if I had a choice (maybe the soft edge one is an exclusion), but in a cinch, you wanna keep this in the bag of your head.