This is a great question, so i cleaned up some of the posts that have been getting us off track.

Since I am unable to carry a firearm wherever I go, my list would be:

1. Knife
2. Flashlight
3. Cellphone

So lets expand on the question, what are your next 3?

Mine would be:

4. Wallet (cash)
5. Lighter
6. pocket notebook w/pen.