Martin Pro-2 Art Portfolio, 17 x 22 x 1.5 Inches, Black, 1 Each (66-PRO2003) Hard-sided portfolio constructed of polypropylene that provides durable, moisture-resistant storage for all your artwork Iinterior has a full length pocket that is ideal for pads, tool bags and rulers The alternate side has an elastic restraining strap to secure a drawing board or finished work Each portfolio has an adjustable, removable shoulder strap, rubberized, easy-grip handles and black nylon zippers A value-priced portfolio loaded with features