Herschel Heritage Unisex One Size Polyester Casual Backpack 10007-00007-OS. Product dimensions: 18in (H) x 12in (L) x 6in (W). Features a zipper closure a main compartment with 15 inches laptop sleeve a cross design headphone slot to top a front pocket and an adjustable strap. It has a capacity of 23 liters with water resistance. One size polyester casual backpack. Heritage series.