This is the belt-loop, knife lanyard I wear most everyday. It's tied with 2 colors of paracord, Kelly Green and OD Green, and it's just a series of square knots making a solomon bar with a diamond knot then a 5" long loop. It has a heavy duty clasp on one end and a wood pony bead on the other to snug down the hitch that attaches the knife.
The knife I usually carry is the hawkbill I bought a few years ago to replace the hawkbill I had when I was in the Navy Seabees back in the mid-70's. Back then I carried it in this sheath.
Then about 10 or so years ago I'm out one night riding the bike around southwest Detroit but when I got back home the knife was gone - lotsa potholes and train tracks down there - and it musta just popped out. I felt bad for weeks because I had that knife for more than 20 years.
I still carried a knife after that but it wasn't a hawkbill - they're damn near impossible to find. Then a few years ago I'm out and about and I see one and grabbed it - it's got a wood handle and locking blade.
This was around the time I had started working with paracord. I bought a cheap clasp and went home to create a belt-loop lanyard so I would never lose my hawkbill again while riding the bike or working outside.
Over time I modified the design till I came up with the one I use now. I clip it above my right back pocket.
And since it's been sold to enough bikers, outdoorsmen, workmen, and tree climbers, it's been tested and I know it holds up.
The two modifications I made were using this heavy-duty clasp (that ain't comin' undone!) and increasing the loop to 5".
The longer loop lets the knife sit deep in your pocket so it won't work its way out while you're motoring down the highway (but to be extra safe, put the knife in your front pocket while on the bike).
And you can cut something about waist high without having to unclip it. I've even made the loop a bit longer for some who use it as a hand loop - they attach the clasp to a split ring that goes through their knife lanyard hole.