During the late 60's and early 70's my Buck 301 stockman as my go-to knife. Traveling light while in the army, from base to base, it got used for everything I needed a knife for.
A couple of summers ago, my grandson and myself did a little experiment in the spririt of Huck Finn, and used a Case peanut for all our outdoor needs while fishing. Cut bait, gut pan fish, whatever. The pocket knife got all of it done, but it was a little bit of a pain to clean it really good so it wouldn't smell like fish guts. Now I just used the Swedish mora I have in my daypack. Easier to clean.
One old boy I worked with used a zbuck 303 cadet for his everything knife. Watching him field dress his opening day buck was the motivation I needed to simplify my own stuff.
For most of what you do, a small pocket knife will do. A fixed blade is nicer to deal with though. Most of the rough cobbs I grew up around used the little finn type of knives. Used their pocket knives for the odd jobs and 'saved' the sheath knife edge for hunting.