I carry a small fresnel lens, hair comb, a very small F/A kit with a few bandaids/meds in a tiny zip-loc bag. This weighs next to nothing and gets stored in the pocket of my Tilley hat. In my pocket is my EDC Spyderco Salt 1 and on my key chain is a Leatherman Squirt S4 with a Photon 3 LED. Add wallet and cell-phone -- This is my minimum.

I also have a Leatherman Wave 2, a modified AMK Survival Pak, Petzl Tikka Plus headlamp, cell-phone charger, maps and reading glasses in my briefcase. If I wear a jacket, it may also contain a wind-proof lighter and another set of reading glasses.