On another note, I think the question of urban EDC and survival kits is harder than that of forest or rural survival. More variable situations.

I tend to think about it this way:

What do I have on my person, at all times, baring the intervention of local rules (e.g. D.C.'s government buildings)?

For me, this is a quality light, SAK or Multi-tool, keys, cell phone, wallet, credit cards and Cash (about 50$, small bills). These things are intended to get me back to the office or car (where there is a larger get home kit, contents a separate discussion).

My basic idea it that if you are in the typical high rise building and the power goes out, you are in the dark except for the rare and usually inadequate emergency lighting. You need to get back to your office/car where the bulk of your equipment is. So, things like a FAK, lots of water etc. are not strictly necessary.

Also, try to know the buildings you are in. Locally, some have stairwells that if you go in, the only way out is on the ground floor--no exit to another floor. Bummer if you just need to go one floor back to the office and the elevator is out.

In my experience, you can't go to a formal business meeting dragging a backpack of equipment. A briefcase/laptop case would be the max socially acceptable, so this constrains how much you can lug around. The gals have an advantage in that they can also have a purse and it not be noticed, so more room. Remember, you still need to carry what you actually need at the meeting!

The next major issue is the commute to and from work. If you drive, you have lots of room for equipment--take your pick.

If you take public transport, you are again limited, this time to probably a backpack size bag or rolling bag. Here is where you want most of the stuff that would keep you going for a couple of days or longer, presumably to get you home or to a large stash of equipment. Specifics of this kit depend a lot on weather and the type of transport, e.g. bus, train, subway, or a mix. In all cases good walking shoes (waterproof a good idea) are a must, as is clothing that will keep you comfortable in the outside weather.

So all my urban survival plans are oriented toward getting back home where the family is and I have considerable resources. Perhaps it is wrong, but I do not seriously plan on a totally "come as you are" bug out to parts unknown.