Same here in MT. Our open carry laws allow for just about anything providing it is openly displayed, but I recently learned that if I am wearing a coat and less than 3" of the weapon is showing, I can get busted for carrying concealed. Knife or gun. And the largest knife I can carry concealed is 4". Shoot, My folding knife (normal ranch work, always in back right pocket) is over four inches, and my pig sticker, which I will often wear under my coat, is 7"+.
I can get busted
in MONTANA
for carrying a knife.
Imagine that.
So a class 1 CCW must be had, just to carry my knife. Now, most cops pay no attention to these regs up here, to be honest, but in the future, there may come a time when I have the right to remain silent, but not the ability; and in the course of such an event, piss a cop off enough to cause him to do me damage - and without that CCW, I would just be boned.
There just don’t need to be any laws about knives. Whatsoever.
It’s fine to have laws about what people DO with knives, but there’s no real point in making any carrying of any sort of knife against the law.