My wallet is a regular tri-fold leather wallet and in there I keep:

1. One of those fold up survival info cards
2. A fresnal lense
3. A few saftey pins
4. Some Spiderwire (I forget the exact length)
5. A piece of hacksaw blade (coated in nailpolish to stop rust)
6. One of those card SAK things with a light
7. A folded up piece of tinfoil

Being I don't keep many credit cards on me and my identification is kept seperate in my badge wallet my regular wallet isn't too thick.