I would agree with you about water, fire and medical needs having paramount importance in a PSK, especially a mini-PSK where space is at a premium, but ... you knew there was a but, didn't you? We cannot always anticipate, let alone dictate, where chance will plonk us down when Mr. Murphy comes calling. I keep 3 wire "snares" in my mini-PSK that goes everywhere I go. They are actually 12-inch steel fishing leaders, so they can do double duty, they take up almost no space, and a foot of pretty tough wire might be a good thing to have sometime. Same with the fishhooks, you never know where you'll end up. The fishing line can be used not only for that, but also for repairs, making things or jury-rigging something to get you through whatever emergency you're dealing with. A little of everything is better than nothing of anything, I think.