Cut 8 strips 6 inches in length from the backpack strap material.
Approximately a foot from the edge of the circle, sew one of the strips in a loop fashion onto the fabric.
Repeat the process above for 7 more loops and maintain an equal distance between loops (approximately 6.5 inches on the outer diameter of a circle with a foot smaller diameter than the larger circle).
Cut 2 strips 4 feet in length from the backpack strap material.
Loop the cut strap through one of the loops and then sew the ends together.
Repeat the process above using a loop adjacent to the one previously used.