The Martin Pro-2 Portfolio series is constructed or Polypropylene, not recycled cardboard as many portfolios in the market today. Pro-2 offers an incomparable value for student or professional. The interior is built with one side with a pocket and the other side with a elastic restraining strap. Size: 23-1/2-inch-31-1/2-inch-1-1/2-inch. Complete with adjustable shoulder strap. (Art supplies not included).