The AP Series Fitzroy rucksacks feature the Arkiv® closure system and is available in three different fabric variations: HT500 high-tenacity fabric, MultiCam-Black Cordura, or American-made 10 oz. Waxed Canvas. The combination of a double urethane coating, an internal frame sheet, and our patented Arkiv closure system results in an exceptionally durable and beautifully constructed barrier to the elements.