brian,
I am so used to having nothing in my back pockets now, I don't think I will go back. My back and my rear thank me daily. I do have some nylon hiking pants that are made to be worn with a back pack and the pockets are cut such that the "front" pockets and "back" pockets are right next to each other, with the side seam being the divider. They are the only types fo pants I have where I put stuff in the back. They have cargo pockets also.

I guess it may be sacrilege to say it here, but I don't carry my PSK around in the city unless it is cold outside. I carry it in my daypack which goes with me most places. I always have at least one knife on me, tweezers, a light, P-38, and a whistle. In the summer, in the city, a compass is rather pointless as is a fire starter. I throw most of the bandaids I carry around away because they start falling apart and I can always use my bandana for a cut.

In the winter I usually carry my PSK in a coat or shirt pocket. If I am going out of the city, or to a strange city I am more likely to carry extra stuff.