I usually carry just a wallet, cell-phone, and keys. When it’s colder, I tend to keep them in my jacket pockets. When it’s warmer, I usually wear cargo pants or shorts that have side pockets that are much better for carrying the wallet and phone than ‘normal’ pants (and, no, I don’t care about fashion). If I’m wearing a suit jacket or sports coat, the wallet and cell phone go in the breast pocket.
I find a wallet in the back pocket uncomfortable (and, of course, it’s not secure there). A few coins in a front pocket are OK, but if I end up with more than that, I leave them in a pile on the desk rather than carry them (and a lot of them end up in the car for meters). Occasionally I do carry a computer briefcase or backpack for work, but I never carry a bag otherwise.
No stamps, no chapstick, no checkbook, no address book — you really don’t need that stuff with you all the time (at least I don’t).
