Here is the paracord guitar strap I just completed. The guitar strap is about 6 ft long in finished length and is adjustable. I used short pieces of paracord to tie it to a fixed length.
Using square knotting/macrame type knot work took about 90 feet of olive drab paracord and 50 feet of maroon, and I added leather guitar attachments(sewed on), which I took/scavenged from another guitar strap I had.
And J. Pruitt's photo of the strap with his guitar.