I'm in the plannig stage for quite a lot of my kits. This is rthe way that I see it:

When I go hiking/camping/kloofing etc, I won't always have my 50l backpack on me all the time. I do a lot of 'exploring'/wandering around after the days hiking. I therefore would like to be able to carry something that has more possibilities than a PSK, yet doesn't involve carrying around my back pack.

It is a similar approach to the 'Grab n' Go' bag that was in some thread a while ago. If I am cought in an emergency situation (bush fire/flood?), I would grab a kit that would help keep me alive, while also alowing me to run. I wouldn't be able to do this very well with a backpack.

As I said, this is still in the planning/incomplete phase. When I have got some ideas from the forum, and completed the kit, I;ll post it here for critisism.

Hope this explains my thinking!