re: Why so many backpacks in the gym?

I don't have a problem with gym bags, I have a very small one I use. I agree with you, I don't get carrying it with you everywhere in the gym, when I went to large gyms I left the bag in a locker and carried a water bottle and occasionally a towel. I think some people do it to claim equipment/benches/racks and not have to let others work in.