Thanks to its central zipper that goes all around the bag, it can double its storage capacity to put easily the equivalent of 2 large binders. A back pocket with velcro, a front pocket with zipper (as shown in photo), another internal pocket with zip compartment and 2 pockets on the width of a kit bag ... robust, clean finish, 30 years warranty by Eastpak (seams and closures). I use to work for my tools and docs when I move in troubleshooting and is still in good condition! Machine washable canvas to give it a little updating from time to time.