Place the strap pieces together, right sides facing, and clip/pin. Use a 1/8" seam allowance to stitch along both long edges and one of the short edges of the pieces, leaving one of the short ends open. Use the quick-turn tool to turn the piece right side out. Press. Set the strap aside.

Note: Seam allowances for the following steps are 1/4" unless otherwise specified.

Place one of the yellow rectangle pieces face up on a work surface. Place one of the orange rectangle pieces face down on the yellow piece so the right sides of each piece are facing; clip or pin together along one of the long sides. Stitch the pieces together along the clipped/pinned edge.

Align a white rectangle piece along the opposite long edge of the orange section so the right sides are facing. Clip/pin the pieces together at their long edge, and stitch the pieces together.

Press both seams open. You should now have an assembled piece comprised of yellow, orange, and white sections. Repeat the steps above to make one more piece like this one.

Using the triangle pattern piece as a template, align the top edge of the triangle with the top edge of the yellow sections on each assembled outer piece, and trace around the triangle with the washable marking pen. Cut each triangle out.

Insert the striped outer piece into the top opening of the lining piece. Making sure the top edges and side seams of each piece are aligned, pin/clip the two sections together along the top edge.

On the front side of the pinned pieces, make a line of stitching along the pinned edge, starting and stopping approximately 3/4" from each side seam. Flip the piece over and repeat to create another line of stitching on the back side. Turn the piece right-side out through one of the side openings, tucking the lining down into the bag.

Fold the raw edges of the side openings down 1/4" toward the inside. Press. Tuck one end of the strap down into each opening, so that strap ends are centered with the side seams. Use a pin to anchor the strap ends and close the openings.