The machete sheath is by Ontario Knife Company; it's the 18 inch version.
I got them on sale at BudK when I purchased my Swords.
The sheath has been modified slightly to allow the attachment of the strap system. Holes were drilled into the sheath fabric using a hollow punch drill bit (
6 Piece Hollow Punch Set) and eyelets were set to keep the holes from fraying. (**note that I ordered a custom sized polypropylene cutting board that would be able to fit inside the sheath so that I would have a hard surface to drill on and not dull my punches**)
I also drilled holes in a section of the straps which were double layered, and I affixed them with eyelets as well.
Zip-ties were used in a cross or "X" pattern to affix the straps to the sheaths.
The D-Rings on the left sheath were attached using some 1 inch webbing and some E-6000 glue.
Finally, the "string" tying the tips of the sheaths together is actually a black waxed dress shoelace; I also used a waxed dress shoelace for the cord of the belt knife.
Here are a couple of pics of the sheath/strap system.
The straps were made using a 2 inch webbing, a couple of 2 inch tri-glides, and 2 inch Safariland Triple Locking Buckles.