The Case-it Dual-101 binder is two binders that zipper into one handy, easy to carry binder. Each Dual-101 offers two sets of 1 1/2 Inch D-Slant metal rings, at standard 3-ring measures. Each set of rings includes Velcro dividers to secure contents in place. You can arrange it any way you want, keep all your subjects in one binder. There's even an inside pocket for a calculator and a removable zippered pencil pouch. An additional zippered front pocket is great for keeping some cash, writing instruments, your id, etc. The Dual-101 comes with a unique angled zipper design along with a handle and shoulder strap for easy mobility. The Dual-101, 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.