SUPERIOR MATERIAL: Durable oxford with water-proof function, easy to clean. Ensure a secure & long-lasting usage every day. PRODUCT SIZE: 11.8(L) x 6.3(W) x 17.7(H) inch. Spacious main compartment with separate laptop slot holds up to 15.6 laptop. Breathable Elastic sponge shoulder strap and backside provide your extra back support and feel more comfortable. MULTIFUNCTIONAL STRUCTURE: 3 MAIN pockets & 1 INNER small pockets & 2 SEALED SIDE pockets, provides a separated space for your Laptop,textbooks, magazines, iPhone, iPad, pen, keys, wallet, books, clothes,bottle and more. A luggage strap allows travel backpack fit on the suitcase. EXTERNAL USB CHARGING PORT DESIGN: Provide an inside USB that plugs into the portable charger. Your electronic device can be charged by connecting to the outside USB port, which is a more convenient charging way. COMPREHENSIVE USE: Ideal for using as book bag, travel backpack; for daily use at school, work, weekend, outdoor holiday, outdoor activities, occasional travel, gyms, hiking etc. Suits students, teens and adults.