Mark a rectangular area around one of the jean pockets and cut it out.

Turn over the top and sew to give it a finished edge.

Cut out the other jean back pocket close to the edge to use as a flap. Trim the top to the length you want.

Cut out a piece of denim from the jeans to match the size of the first pocket cut out.

Pin the second cut out pocket on top with right sides facing and sew it together along the top edge.

Next, lay the original pocket on top of the second pocket with backing with right sides together.

Sew the sides and bottom together and clip the bottom corners.

Turn right side out.

Add D-rings to each side by cutting two 1 inch squares of denim. (That's where you will clip on the leather strap.)

Fold the denim over and slide a D-ring over top.

Then sew both edges to each side of the bag.

Add a snap on the bottom center of the flap for closure.