Wear the PS 75 logo proudly on this classic size backpack, measuring 17 inches high, 12.5 inches wide and almost 8 inches deep. There is a generous 1,650 cubic inches of inside space. It has four zippers, and that's just on the outside! Three of the zippers are two-way zippers, for easy access in any situation. The first two- way zipper opens an organizer section with three pen slots and an internal zippered pocket with an attached strap to hook on an extra set of keys. Behind that zippered pocket is an open pocket! Behind the second and third two-way zippers are generous open spaces, the third space even has a velcro strip for items you need to secure. The one-way zipper gives you easy access to an exterior pouch pocket.