I made a bag once and put pockets inside. I took a piece of fabric that measured 8-1/2" tall and the width of the inside of the purse. I folded the fabric so it measured 4-1/4" tall and the width of the purse. I put a seam at the long side and then turned that tube so it was right side out. I folded it into thirds and sewed the fold lines to the lining of my bag with the seam pointing to the bottom of the bag. And I just seamed the ends into the sides of the bag when I put the bag together. I hope you understand what I am trying to say here.