I think that having a "non camping GHB/BOB" is a good idea. I think I'd term this as a "go bag" or even a "ditch bag".

What's in it will depend a lot of your situation. How far are you from home? What's the weather like? How fit are you? How populated is the area in which you live? How resourceful are you?

I don't have any answers, but let me put together an example.

If a person who has the primary concern of getting home without a vehicle regularly runs half marathons, lives outside of a major city (no mass transit, small towns) in the northeast US, and works fewer than 6 miles from home, 8 months out of the year, a jacket and sneakers are probably all that person really needs to get home.

Again, this is just an example.

Similarly, there are probably people who could walk out into just about anything with a leatherman, a lighter, a good set of clothes (for the weather) and the gift of gab and end up doing just fine wherever life takes them.