Really minimal - Spydie (generally D2 Para, S90V Manix2 or Phoenix right now but whatever it is that day), wallet (unknown, leather), keys w/ green Ladybug and Atwood Prybaby, S/A G-Shock Mudman. That's it.
OTOH, when I'm out I always
have my car and it's full of the kind of stuff you guys are listing: Cell phone, flashlight, couple more knives, Spyderco Profile set, Lansky keychain serration sharpener, axe, fire sticks, anticeptic, Maui Jims (mine and the wife's), bandages, various OTC meds, case of aquafina, gloves, hats, snowshovel, GPS, chess set
(you never know) etc etc etc....