I had my wife sew a slot to the front left pocket on many of my jeans and so any folder under 4" works well and really not noticed until I need it.
currently have the #72
The Queen #06L teardrop linerlock is 3⅞" closed, but the spear blade lies so low in the blade well that they carry beautifully, while still giving plenty of cutting power.
A nice, pointy spear.