The pliers can tighten nuts, like your battery terminals which need to be checked often. The screwdriver saved my bacon when my front depthfinder mount came loose during a tourney on Lake Michigan. I also have used my knive to cut lures free from underwater ropes that i have hooked, which when throwing a $16 japanse crankbait, the blast can pay for itself very quickly!
So if you don't have a multi-tool get one for your fall fishing and hunting excursions, or think about getting one for your outdoors hubby for Christmas!