For my uses, a 4 inch knife just leaves me wanting more. I always carry a large folder, 3 1/2" and up, but sometimes I just need more, especially in a fixed blade. I'm not using it to process game though. I am in the bush or in the yard and there is always rope, vines, shaping a limb, trimming around a tree, etc. 5 inches carries easily - no need to tie it down when I am running.
Anything bigger than that and I just go big - 10 inches or more.
Last edited by adnj; 12/18/13 10:33 PM.