SLAYER - Skulls Backpack Introducing the ROCKSAX rucksack, perfect for school, festivals and everything in between. Load up the spacious main compartment and adjust the straps to carry your items in comfort all day long. Crafted with resistant polyester fabric and lining. Spacious front pocket, an internal divider, an external media/headphones port, and adjustable padded straps. Measures: 17.75 x 11.75 x 6 and has a 5.25-gallon capacity.