Maybe a sheet of plastic template? I just tried it with my medium DOP. Because it’s see-thru, I laid it on top of the pouch to mark the inside edges...
One side of the MCB strap is stitched to the bag, the other side slides thru a plastic rectangle. I purchased a pack of 1.5” “Metal Adjuster Triangle...
I recently cut the strap off my MCB so I could use an Absolute Strap with it (really don’t like the built-in strap with on that bag). I waited until...