id say my bare minimum is:
small knife
small light (like a photon knock off)
lighter
cell phone
cash of course

mostly because its the summer and i wear alot of short (no cargo shorts right now), and i cant carry too much or else my pockets look like im carrying even more then i am and reaching into them for a specific item is a pain.

when im wearing jeans i use alot of clips and a few pouches on my belt.

but i sweat like an animal so traveling light in summer is a must.