The Opti Hacker backpack features 2 external pockets and 1 mesh bottle pockets. This functional backpack is ideal for short trips or for hauling heavy files and sports kit to work or school. The lightweight yet durable construction together with the padded adjustable shoulder straps and back panel help reduce strain on your back and shoulders. The main compartment features a laptop sleeve with quick and easy organisation. 2 external pockets. 1 mesh bottle pockets. Laptop sleeve pocket. Adjustable padded shoulder strap. Lightweight, durable construction. Backpack specifications:Size H43, W30.5, D15cm. 20 litre capacity. Weight 0.4kg. Material: polyester. Backpack features:1 internal pocket and 2 external pockets. Adjustable and padded shoulder strap. Top grab handle. Padded laptop compartment. Built in document holder. Suitable for A4 documents. Splashproof. waterproof. General information:Manufacturer’s 1 year guarantee.