The Case-it s-817 open tab Velcro closure binder is an efficiently designed organizer that features three 2-inch O-rings, a five-color, tabbed expanding file, inner zippered mesh pocket and inner folder pocket for papers. This easy-to-use binder also features a convenient flash drive pocket on the inner cover and two elastic pen/Pencil holders for added organizational convenience. The s-817, like all of Case-it 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.