You may have seen these with a few different knife makers over the years here. First batch is a neck lanyard with a simple loop you can cow hitch anything. Works well with kydex sheaths.
$20 shipped each; Left to Right:
1 Round Black Leather
1 Round Grey
1 Square Grey
2 Square Brown-ish
1 Square Grey Camo
$20 shipped each; Left to Right:
1 Round Black Leather
1 Round Grey
1 Square Grey
2 Square Brown-ish
1 Square Grey Camo