Here's how I keep my leveled book bins organized in my classroom library. For larger tubs, I place a rectangular-sized tissue box in the back of my books. For smaller bins, I recycle my square-shaped tissue boxes and do the same.
This tip will keep your books facing forward and upright--the best way for your readers to make their appropriate selections. Doing this not only adds order to your classroom library, but also keeps your books from bending. It's the perfect way to prop your books up when you may not have enough of any given level. Check out this before and after shot!