Who said anything about a minimum?
Seriously, the actual minimum is my keychain, edc knife, wallet, watch, comb, lighter & cigs, pocket change and (about 75 percent of the time) cell phone.
The bag & a bottle of water go to work 5 days a week and on road trips, but the bag goesn't generally get carried on around-town jaunts.
But re the max ... the apt & truck are both mondo equipped!