The Case-it Mighty Zip Tab Zipper Binder is an efficiently-designed 3-ring organizer with a five-color, tabbed expanding file folder. This large-capacity binder includes a gusseted zipper made with ripstop material that conveniently keeps tears from spreading. The zipper has a unique angled design to make it easier and quicker to zip things up when packed with your important papers and materials. The D-146 uses Kraft board instead of PE board to give its binders a firm, stiff shape that won't buckle or warp. The spine is specially designed so that your binder can lay flat when open, making it easier to add or take papers out, and to take notes in. Case-it produces quality binders offering unique organizational tools for school or home use.