For me it goes like this:
I use to carry a belt sheath with a AAA MiniMag and a SAK Fireman, but work has changed its dress code, and sheaths of any kind are not considered "Professional attire" now. (I am a IT Network Amin/MIS Manager/Professional Geek) So I had to re think my EDC items. I am not in the city by any means, but I still work in the very center of my building, with no windows in my office. So I carry two lights, a Gerber Infinity, and a MiniMag solitare. Reguardless, I carry a 84mm SAK with a woodsaw. I consider the saw to be a critical part of any EDC, urban or otherwise. So my EDC items look something like this:
On me:
SwissBanico 84mm Alox Lumberjack or Scibeer 91mm Alox Woodsman SAK
Victorinox Alox Moneyclip
Victorinox Officer or Timex Maxedition watch
Gerber Infinity
MiniMag Solo
Banadana
Gerber Clutch Mutlitool
Cellphone
Lighter
Wallet/Money
Keys
(2) Pens, (1) Sharpie
In my Computer Bag (never more then 10ft from me)
(2) Waterbottles, one on each side
Victorinox Spirit Multitool
Kershaw Mini Cyclone
SAK Fireman+SAK Soldier
Banadana/Paper mask
Victorinox AA LED or Gerber LX 3.0 or Rock River LED
Emergency Blanket
Poncho
(5) Glowsticks
(5) Energy bars
(5) Gartor Aide power packets
Coutry Comm GP-4L AM/FM/SW/LED Radio
25ft of 330LB Climbing rope
Spare socks
FA Kit (Bandages, Tape, wipes, latex gloves, etc)
Spare Glasses
Spare lighter
Gloves (canvas work)
Pens, Pad of Paper, Sharpies
USB Hub/SD/CF Reader, SD cards, CF Cards
Sony Viao or IBM Thinkpad Notebook
PDA/Case
My EDC bag that stays in my car or truck:
County Comms Bail Out Bag
2 Meter Radio (Ham)
70cm Radio (Ham)
Grundig 100P AM/FM/SW radio
Cobra FRS radio with weather and "SAME" alert
Spare batteries and Chargers for each radio
(2) Water Bottles with metal cup
Kershaw Mini Cyclone
SOG Multitool
Gossman PSK
Gerber Infinity Ultra LED
Gerber LX 3.0 LED or Victorinox AA LED
Compass/Maps of local area
ID (NH-Ares, Drivers Lic)
Money ($1's, $5's, change, one Visa with $300 Limit)
Spare AA's and AAA's
25ft of 330LB Climbing rope/50ft of 550 paracord
Cigarette plug and adapter for radios
Space Blanket
Poncho
Ultra thin blanket
Food for 72hrs (Energy bars, instant oatmeal, soup, snacks etc)
Glow Sticks
Magstick/Firesteel
Gloves (leather)
Roll up J-pole antenna, coax, etc
Sunglasses and safe glasses
Wow I never realized how much I carry...!
Anyways, the EDC bags in my cars never get used or touched unless I am called up for Ares/Cert (has never happened.... yet). Basically I decided to carry on my person everything I could need, but might not be able to salvage to get home, and if I happen to have either bag, thats a plus. My co-workers have no idea what I carry other then my notebook computer, PDA, and the like in my computer bag, and the Ares bag is in my car. I have items like a solid pry bar and such in my office.
In my office at work I keep a heavy leather jacket and solid (if a bit worn) work boots I can change into if need be. As well as a heavy jacket and boots in my car/truck.