We've upgraded our popular book bins to make them more functional than ever! Each one now includes a swing-out bottom stabilizer wing (patent-pending) that helps prevent the bin from falling over when full. The wings extend 1 on each side, but can be overlapped to save precious shelf space just swing them back in to stack the bins for upright, compact storage. And each bin includes a built-in label holder with a clear protective label and colorful cardstock labels so you can easily identify contents.