Classic business backpack.Simple and casual.Two types can choose:2.0 Version backpack: Regular style, width expandable 6cm. Suitable for daily office.3.0 Version backpack: Upgraded style, add computer compartment behind the backpack, larger capacity. Suitable for travel.Multi-layer large capacity2.0 Version backpack can fit 15.6 inch laptop, can accommodate 2-3 days clothing.3.0 Version backpack can fit 15.6 inch laptop, can accommodate 5-7 days clothing, make you worry-free travel.Warm tips:2.0 Version backpack don't have rear zip compartment, don't have waterproof bag.NOTE: Please choose according to your needs.Backpack capacity:Backpack capacity is equivalent to 20 inch trolley case.Travel use a backpack, easier and more convenient.