Martin Pro-2 Portfolio, 24-1/2-Inch by 36-1/2-Inch by 3-Inch Interior measures 24 x 36 x 3" and Exterior is 26 x 38 x 3.5 Polypropylene construction rather than the recycled cardboard interior that currently floods the market Incomparable value for student or professional Interior is built with one side with a pocket and the other side with a elastic restraining strap Complete with adjustable shoulder strap; 3-Inch gusset