It is an interesting question. I hadn’t thought about it, but for me, I guess, the answer is that there is no such item.<br><br>I’ve done lots of day hikes from, say, 3-11 horizontal miles in warm weather with nothing more than the normal contents of my pockets (or less, sometimes, as I tend to leave some things in the car) and a water bottle. Maybe that’s imprudent.. but the worst that has happened is that I’ve been drenched by summer thunderstorms, which, if you’re going to keep moving, is no big deal. Sometimes getting wet is more comfortable than rain gear anyway, when it’s warm out.<br><br>Similarly, I once thought I might be in trouble when a the stitching holding a strap in place on a pair of Merrill hiking sandals started to go, and I had no needle, thread, or tape. But… it was summer (or I wouldn’t have been wearing sandals), and I’ve experimented with barefoot hiking since then (barefoot hiking and even backpacking are increasing in popularity... do a google search on "barefoot hiking", you'll be amazed) so what was the big deal? So, it’s slower- there was no real hazard. <br><br>For more challenging hikes (wherever there might be a real hazard) or backpacking, pretty much everything in the PSK is, or should be, a backup to some other piece of equipment. When I was younger I did a great deal of backpacking without a separate PSK, though I might have had backups for some essential gear. If I lost the PSK, I might redistribute some items from pack to pockets, but I can’t see calling the trip off just because I don’t have two of something.<br>