Try making a zipper pocket to improve bag utilzation! The instructions on how to make a zipper pocket are as follows.
1 Draw the zipper opening line onto the wrong side of zipper pocket piece. – Your desired zipper opening size X 1/2″ (12mm) height. Place the zipper pocket piece onto the fabric with right side together. Pin and stitch in an rectangular shape. Backstitch on starting and ending points.
2 Cut out the inside as indicated on the zipper pocket pattern.
3 Insert the zipper pocket piece toward the wrong side of fabric.
4 Press the opening. The right side of fabric will look like the picture.
5 Match the zipper’s right side with the fabric’s wrong side, pin in place and stitch the zipper 1/8″ away from the edge of the opening in a rectangular shape.
6 Flip the fabric piece, so you can see the wrong side of the fabric. Place the other zipper pocket piece to the attached zipper pocket piece with right sides together. Stitch in a rectangular shape. Stitch only the two zipper pocket pieces.