DeII Business Travel-Laptop BackpackEXPANDABLE & LARGE CAPACITY : Normal capacity is 9. 6L, After Expanding: 24L. OIWAS extra large backpack with expandable feature offers you more packing capacity. Unzipping to get 24L storage then can easily hold laptop, clothing, folder, books, camera bag or other items. MULTIPLE POCKETS & ORGANIZED : OIWAS mens work backpack owns many independent pockets for large storage and organization for small items. A separate laptop compartments can hold 15.