Sometimes it feels like urban survival kits are a dime a dozen on Intructables, which is great. But it seems to me that that types of "survival" situations you commonly run into in a day-to-day urban setting are of a fundamentally different nature than those you might encounter in, say, the wilderness, and I've seen a few urban survival kits that I felt didn't address this fact very well. So I sat down and tried to think of all the 'survival' situations I've encountered in my urban life, and designed a kit to meet my own specifications.
Here's my survival kit, tailor made to get you out of many situations a cosmopolitan urbanite like yourself might encounter. I'll go through each item briefly, and give an example 'survival' scenario where it would be useful.
Step 1: Case
This is the outer shell of your survival kit. You want something small enough to fit comfortably in a pocket or a purse, but just large enough to fit all of your survival gear. Durable materials are a plus here, as anything in your pocket (or at least in my pockets it seems) can take quite a beating.
I used this stainless steel business card holder that I bought at the dollar store. I like it because it is sturdy and compact, and has no protruding corners that might get uncomfortable in a pocket. An altoids can or similar would also be a perfect choice.