I carry a RAT knife in the field (RAT 5 http://www.eseeknives.com/eseeknives.htm) and an folding applegate fairbairne in my pocket. I really like the applegate fairbairn knives. Makes me feel all old school.
the Gerber/Harsey folding Applegate-Fairbairn? Col Rex had a hand in the design of that knife.