Keep important papers together with this Staples 3-inch 3-ring heavy-duty view binder. Store loose pages and letter-size documents in this heavy duty binder. With 3-inch D rings, this binder holds up to 650 sheets and secures them flat without creases and lets you turn pages easily, while the easy-lock mechanism prevents gapping or misalignment. View windows on the front and spine let you quickly slip in customized covers. Four stacked pockets inside this Staples three-ring view binder provide extra space for unpunched papers.