I had a big ass D2 super modern new & improved KaBar strapped to my pack for a while. I found it to be an unsatisfactory system. When I wanted to use the knife I wasn't wearing the pack. Which lends itself to putting the thing down somewhere , cause the sheath isn't where it belongs , on your belt.
Strapping it to your gear makes sense with LBE rigs , because they stay on after your ruck is off.
Knife goes on pants' belt now. But not the KaBar , I have smaller knives ( RAT 3 or benchmade Snody design ) which are more useful for the majority of matter separation tasks.