What a great question! Ivory or stag swayback 3 1/2, (3 1/4 would be acceptable). And single or double.... Tony or Reese...either, either. But I have to say those half congress models are nice. Single spring fits the pocket real nice. But I would also go for a lockback whittler. Oh Boy! I could go on and on. We'll see all of you at the Blade Show.