Not again....

I have to start paying more attention to my wallet. Recently I have forgotten it in various places including computer stations, restrooms and classrooms. I'm very fortunate that there are enough good people around. Nothing has lost yet, but I'm afraid that I might lose something in the future. Maybe I'll put only cash in my wallet, and keep my credit cards and ID's in a more safer place, my bag for example. Then the maximum damage is some cash which is much simpler than losing ID cards. But well, I have also forgotten my bag before (in the student center, for 5 hours)....hmm.... then where is safe to me?