The Case-it Z-Binder 2-in-1 Zipper Binder provides twice the organizational storage in one efficient binder. This easy-to-use organizer features two 1.5-inch D-ring binders with boosters, two inner elastic pen/pencil holders, multiple inner and outer pockets and a handle and shoulder strap. The patent-pending design opens in a Z-shape, creating a virtual desk of drawers right in your binder. This product, like all of Case-it's binders, 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. Please note : The model number might vary (Z-175 or Z-176) but the product is the same.