Constructed of durable, lightweight nylon and designed for versatile carrying applications, this portfolio is spacious enough for carrying extra project supplies and pads. Fits Alvin PXB drawing boards. Extra long handles become shoulder straps. Third handle provides extra control when using shoulder straps. Features side zippers and hook and loop fasteners at top for easy access. 7 1/2 inches x 9 inches outside pocket and 1 1/2 inch reinforced gusset. Fits PXB21.