Out in the woods, my minimum PSK is a PSP+ and a 2-person Heatsheets. I've added a mini-Bic (with cable tie "safety") and a P-38 can-opener secured with a bit of tape to the PSP+.

This is in addition to my EDC, which includes my iPhone, a knife (Rittergrip or EDC Forums Manix 2) at least one flashlight, a full-size multitool, and a pistol with a spare magazine anywhere I'm legally permitted to carry it. My iPhone has iTopoMaps on it, and I download the quads for anywhere I expect to be, so I'm not dependent on a wireless carrier for my backup navigation system. I always drop a "pin" at camp and the trailhead.

In urban environments, I'm almost invariably within walking distance of my car or carrying my laptop bag. My car kit is fairly comprehensive; my laptop bag kit is optimized for weight and bulk and many compromises were made.