I roll with a knife per purpose/carry method and then let those method/purposes overlap, so at any one point in time I have one, but often up to three. I have diet needs that mean I carry a small cutlery set in my edc/wandering around backpack, that includes a knife. When at work I belt carry a leatherman. My lunch kit also has a cutlery set. When off work, I have some kind of knife in my pocket. Honestly, this is less of a "carry a knife all the time" and more of an "if I have this with me, I know I also have a knife" because I'm not an "organized" person, so I have to develop habits to compensate (this also includes having a snack, notebook, pen, etc) in some form within reasonable finding range at any point, no matter where I am. I'm not precious about the knives per se, they can all be pressed into service should the need arise, but they are also selected based on expected use, so my food knives are a stainless opinel and a broker sanyougo, utility knives are SAKs or Leathermans, and my hiking knives are a combo of fixed and folders (it will shock no one that I also have a spyderco salt manbug that lives in my tackle box) basically, if I own a bag, it probably has a knife living in it, so that by accident I will have at least something that will work.