Book backpack is a waterproof backpack with a minimalist silhouette with clean lines and perfect dimensions for urban trips. The design includes a front panel with zipper closure through which you access its spacious main compartment, which includes a padded laptop pocket. Its design also features a front pocket, a mesh fabric carrying handle and a padded back panel. Its finish includes padded and adjustable back straps. Book backpack is made from rains' signature waterproof polyurethane fabric and designed to offer carry strength, durability, and a smooth finish. Material: 100% polyester with polyurethane coating lining:100% polyester water column pressure: 8000 mm volume:14.4 liters/3.8 gallons weight:680 g/24 oz covered zipper closure single main compartment front zipper pocket padded 13” laptop pocket padded mesh back panel padded adjustable back straps mesh carrying handle this product is designed for use in mild to moderate weather conditions.