BOPAI Large Capacity College/Business Breathable Laptop Backpack with External USB Interface (Black) PREMIUM MATERIAL: This stylish backpack is made of hightest wear-resistant,water-resistant microfiber leather and durable ballistic Nylon material. LARGE CAPACITY : Soft flannel compartment protects up to a 15.6 inch laptop and it can reduce the friction between the backpack and the computer. Additional 2 compartments with an organizer and zipper pockets to store pen, charger, power bank, cable etc. Side pockets as added utility. INVISIBLE ANTI- THEFT DESIGN : Unique concealed double zipper design increases the security of your stuffs of value inside. One hidden zipper pocket equips on the back to pack your wallet, money, cards. This invisible design increases the security of your stuffs of value Inside. The physiological curve back and breathable design gives support and prevents sweating. One invisible card pocket in the left shoulder strap. USB FEATURE : External USB port with built-in charging cable enables convenient charging by connecting your power bank with your electronic devices. STORAGE & TROLLEY STRAP : Total capacity is 21 litres. Suit for 15-15. 6 inch ultra-thin laptop. Dimensions: 31 cms x 15.5 cms x 43 cms (LxWxH). Insertable pull rod design to adjust your bag on the trolley and enjoy smooth travel.