What I've been settling on is a total of three small packs, each with a Ritter PSP amongst all the other stuff. I have my standard day pack (Kelty Basalt) which is pretty stuffed with everything but a sleeping bag that I might need for any likely scenario. When hiking, I carry the PSP in my shirt or pants pocket. Also have a smaller slightly less equipped Mountainsmith Day lumbar pack. A second PSP in there. This is the pack that rides in my truck.

Lastly, I finally gave up on my recently assembled belt pouch personal kit as I just wouldn't want to go wandering off with what I was able to carry in it. On the one hand, quite complete but on the other, there were more items I wanted to be able to carry. So I bought a little High Sierra fanny pack which even comes with two 500 ml Lexan bottles. This is the smallest pack I'm comfortable with in the field.

My view is towards redundancy. I have three of Doug's little pocket kits because they are nearly perfectly designed for the average 1-2 day survival situation. However, I have a few more of the Spark-Lights, Tinder-Quik, wire, foil, fishing hooks, safety pins, compasses, etc. along with my assortment of tools, alcohol stove, garbage bags, gloves and hat, raingear, and so on that's regular use stuff. The PSP's are not used as I know how to use all the gear in them and have duplicated it already. I transfer one to my pocket, just in case.