For work, I carry an old Queen #10 Heavy Jack. It's a 3 3/4" two blade jack...clip & pen. I find that it's a perfect size for work. On weekends and off days, my first choice is my GEC #68 White Owl. Others include my Case SBJ, GEC #33 conductor, H&R Whittler and one of Case's newest....the #28 Tear Drop 2 blade Jack in Pocketworn bone (it's a really neat design).