PVC backed heavy duty nylon material. Main compartment has a zippered closure. Bag contains 4 zippered pockets. Padded adjustable backpack straps, and a very convenient carry handle on the top of the bag. Water resistant. Lightweight and comfortable. A favorite of military personnel, campers, bicyclist, hikers, fisherman, outdoors men, students, and much much more. GI Government Issued type. Black deluxe waterproof nylon back pack. Dimensions 16" x 12" x 5.5" (inches).