My bathroom is a bit teeny so I added a plastic, three-drawer unit as storage for my time-of-the-month lady supplies. In order to divide the supplies into their relevant scheduled time during that-time-of-the-month I needed some drawer dividers. I was not about to buy anything so all I did was measure the width of the drawer (10 inches EXACTLY) and cut the same width pieces out of an empty cardboard box. In my case I painted these cardboard dividers first then cut them to a smidge LESS than 10 inches before inserting them in the drawer. They wedged in perfectly.