To each their own, but that seems like a strange approach- carrying something in the PSK just because you might want it while camping. That could equally apply to almost anything.

I've never trapped, I don't aticipate doing it for pleasure (it's illegal in most areas I've been anyway), and I'm usually not staying in one place in the wild long enough to maintain a trap line, but I do carry a small (about 6 oz) fishing kit backpacking even when I don't expect to use it. Though it's pretty light, it's still too big for a PSK.

Camping is not survival, unless you're really doing it wrong. :-)