I took 2 full levels on my bookshelf with bookends on each sides and organized my store purchased patterns that way. They fit on 2 shelves each 21" wide. Organized by crafts and holiday creations, then by adult or childrens sizes. I have McCalls, Butterick, Simplicity patterns among others. This works very well as the bookshelf also has my sewing and quilting books on it, in addition to all my cookbooks and other books, fiction and non fiction. from, Debbie, Phoenix, AZ