This company always has the longest names... the whole Combat Commander series... sounds like something from GI Joe, and they look like it too. Still a good $20 one.
You could trim off that plastic belt loop each side 5-6mm by 1.5cm lgth giving you some space for drawing the knife or drill 3, 6mm holes for the sides using shoe lacing/elastic cords to your back pack strap vertical/upside down.
