The lounge chairs at the pool are clearly marked with the "NO SAVING OF CHAIRS" signs. I figure that if I'm at the pool for an hour--any chair that hasn't been touched in that time is fair game. I don't feel guilty moving the towels that someone has left on any chair. I don't think I would move other personal belongings, but many times people get up and leave the towels on the chairs with no intention of returning anytime soon.