I love not having anything on me, because I don’t have to worry about losing anything. I always carry as little as possible. If I’m driving someplace I keep my phone, license, cash, and keys (except my car key, which goes in the tight little pocket in my jeans) in the car. If I’m walking and I remember I’ll bring my phone (I don’t usually remember, and I don’t usually need it) and anything else I might need.
Last summer I spent a lot of time roaming around, sleeping random places, and generally not needing to have anything on me. Everything I had was just something to lose. I stopped carrying a wallet then. It was nice not having that weight in my back pocket. I never went back to carrying one.