Always have some sticking plasters, a couple of folded sheets of kitchen roll, antiseptic wipes, insulation tape and a few Anadin tabs.
Last used before Christmas when pike fishing, managed to get a size 6 treble well lodged in my finger. I yanked it out with my Leatherman, cleaned up the bloody hole it left,with the kitchen roll, wiped all around with the atiseptic wipes , applied a couple of sticking plasters, covered the lot with a few wraps of insulation tape to keep the muck out , rebaited and got on with the fishing.
I have carried a kit as above for many years, it has been used quite regularly either on mysef or fishing mates .
Dave