A 3-blade pocket knife is with me, as Stam said, except in an airport. It is/was the universal tool for working in the field. We initially purchased all sorts of tweezers and such only to find that the sharp knife worked better. Some of the folks had folding Buck's, but that was about as big as it got.

When I started hunting deer I carried the "standard" fixed blade hunting knife. Then watched my Dad gut deer with his pocket knife. Must say, it works a whole lot better than the fixed-blade for that.

And, as Stam alluded to, there is/was a whole culture of sharpening the little critter. Every day, a few strokes to keep the edge.