Swiss Army Classic here...always. Sometimes carry that and a Leatherman Squirt P1 if I think I might need pliers.
I'll carry a Spiderco or Kershaw folder in my back pocket for heavy work, when needed.
The SA Classic has been with me for a couple decades. Knife, scissors, file/screwdriver, tweezers, toothpick, in a 1 oz. package. Backpacked with it many miles.

For fixed blade "mora" style, I'll use kitchen boning and pairing knives. I have a Chicago Cutlery boning knife that's light, holds an edge, and has stood up to serious abuse. Made the sheath from pvc and a heat gun.