Soarpop School Business Backpack for 15.6 inch Laptop,Expandable Notebook Racksack for College Office Material: 1680 D elastic Oxford waterproof fabric+ Grind arenaceous microfiber leather. Dimension: 18.1*7.1*13.4 inch, Easy to fit 15-inch laptop,Including many pockets to put pens,phone,ect,and key ring. FRONT INTERNAL ZIPPER to EXPAND to increase backpack capacity,carrying more things for you. SECRET BACK ACCESS for acrossing telescoping handle of luggages,easy to carry it by pulling luggages in business trip. AIRFLOW design to increase air flow and reduce pressure on your shoulder.