UPGRADED MATERIAL: Compared with the basic version, the upgraded version keep the design,appreance and function, only change the materials from Polyster(front) + Oxford(side)+to Microfiber(front）+Polyseter（side). It looks more beautiful and higer level. Besides, with Microfiber material, the waterproof level is much higher. SEPARATED LAPTOP COMPARTMENT FOR 15.6 INCH: Bange Backpack has a separated 15.6 Inch laptop compartment. The thickening sponge can well protect your notebook. The TSA lock can prevent your laptop from stealing. ANTI THEFT BACKPACK: The computer backpack is equipped with a smart secure lock that is made of high strength zinc alloy with a solid, compact body to prevent theft and well safeguard all your valuables securely. The password lock is easy to set (Includes instructions), please see A+ for the detailed instruction. LIGHTWEIGHT BACKPACK WITH LARGE CAPACITY: The size is 18.5in*13.7in*8.2in(H*L*W), and the weight is only 1.5lbs.The capacity is around 32L, and you can take all of your necessary personal items for trip. The stylish and lightweight design is ideal for business trips, commute, shopping or any other daily use. ERGONOMIC BACK DESIGN - Adjustable shoulder strap, breathable shoulder strap are good for relieving the stress from your shoulders. The soft padded backrest gives you maximum back support, helps for the air convection, ventilation and heat elimination, provide comfort while reducing stress on the shoulders.This item is mainly perfect for adult, but not intended for use by children 12 and under BANGE business laptop backpack is perfect for your daily commuter working,it fits 15.6 laptop. It's waterproof backpack to protect your valuable items inside. It is FAA approved flight backpack, you can put it onto the aircraft luggage rack or use as underseat backpack. It's also a weekend backpack, you can put your camera, headphone, power bank, mobile phone into it. High quality waterproof Oxford materials can prevent your laptop and electronic item from raining.