New Mens Vintage Leather & Canvas Messenger Book Bag 14" This messenger bag is made of superior quality cowhide leather and durable canvas which is soft and smooth touch. The aged cowhide leather comes with a rough appearance due to wrinkles and scratches. A thick yet delicate leather, ready to support the most important parts of this bag: the straps,the smooth zipper, the bottom and the top flap.The messenger bag is covered with an adjustable leather flap.