BinderBag™ Backpack. It has the room you need to carry everything you want. Built tough just like our messenger or sleeve bags, but with an extra large external zip pocket for books, lunch, jacket, or whatever else you might need to carry. Features include contoured and padded shoulder straps, an internal pencil pocket, and an internal mesh pocket. This bag is big enough for a school year's worth of notes from all your classes. Designed to fit most 3-ring binders from 2 to 4 inches. Binder not included. Dimensions: 13"w x 14"h x 7"d.