Had a Spyderco Ladybug Salt, sold a Spyderco Ladybug Salt (or gifted it :-\ ? ) Too small for my liking. The smallest I'd find useful from the Spydie offerings for any camping or underground activities would be the Dragonfly.
(left to right - Ladybug, Dragonfly, UKPK, and two Byrd Cara Caras)
I usually have a Swiss army knife (SAK) around my neck, mostly a 91mm Compact (knife, combo bottle/can opener, scissors) or a 84mm Bantam (knife, combo bottle/can opener) and find they ride very slim, are much more useful than just the knife, and do all that is needed of them underground, from cutting up bacon to cutting rope if needed.
I hardly ever need an one hand opening blade, but can OHO just about anything so that isn't a problem.
I like the recommendation on a Leatherman Skeletool, was thinking of carrying that one myself but decided that as I never need screwdrivers underground, and those two bits could be easily lost, I'd rather carry a Leatherman Freestyle for he pliers and the extra blade. (Extra blade for the clean blade/ utility blade - would rather have a clean blade for food
) And also, smaller package
Neither of those pliers are what one would call heavy duty, but will do more than great for loosening a stuck screw gate on a carabiner and similar tasks.
And yes, I'm aware I might have a sharp objects problem.