The pocket folder has a closed pocket on the back section with each side of the closed pocket being freely expandable. Flaps that form the ends of the closed pocket are separated by a fold line into two contiguous parts that are hinged to each other to allow expansion of the pocket. The pocket folder is fabricated from a one-piece blank of any suitable material such as paper, paperboard or plastic and has score lines on at least the back section to permit expansion when materials are inserted into the closed pocket.