Travel Backpack Constructed with durable 600D Polyester Oxford woven material, Rugged, wide-mouth zippers provide access to large cargo pocket with more than 600 cubic inches (9.8 liters) of capacity, Foam-padded, fleece-lined laptop pocket, One external zipper phone pocket and two mesh bottle pockets, Fully adjustable shoulder and sternum straps help heavy loads comfortable and balanced, Mesh back padding and ventilation channels improve comfort