Main Features:- Designed with chest belt for fixing the backpack in your body tightly- Padded separate laptop compartment at the back ( fit for 15 inch laptop )- Ergonomic design with thickened straps and back can balance the pressure on your spine when you carry heavy loads- Made of water-resistant nylon・ you can use it even in bad weather- Multi-layer pockets for you to classify different items- Adjustable strap 50 - 85cm・ meeting your different needs- 30L large capacity and 20kg load-carrying capacity