Leatherman.
Duct tape, bubble gum, a hair pin and one of these
. https://www.youtube.com/watch?v=9dht1VcMfrw https://www.youtube.com/watch?v=vPbubMAYN7g
You can do a lot with a vice grips too.
Fingers get cold after touching those minnows.
The ones I used to fish with just pissed me off so now I fish alone and tool-less. Yea for me.I fish with a couple tools every year. They amuse me.
All silliness aside, I used to keep a small first aid kit, side cutter, and a cheapo harbor freight tool kit aboard, Instead of jumpers, I cut two 10 ga wires, red and black, about ten feet long and put #10 eyelets on the ends to accommodate the wing nuts on batteries. Took up way less room then jumpers.