Case-it Locker 3-Inch Q-Ring Zipper Binder, Blue, Binder Shell Only, LKR-Q-03-BLU Base zipper binder with sturdy 3-inch Q-rings for the Locker System of binder-based organizers Sturdy water-resistant fabric with bound edges Perfect for middle school, high school, or college students studying multiple subjects Built-in handle and shoulder strap Binder only included in purchase - add-on pieces sold separately