Fits 17-Inch Laptop Backpack Business Backpack 3-in-1 Scalable Capacity College Bookbag for Work School

Expandable design: Before the extension dimensions are 19.3x12.6x5.9 inch/49*32*15 cm, and after the extension dimensions are 19.3x12.6x7.9 inch/49*32*20 cm. You can expand the zipper and buckles according to your requirement., Decompression and shock-resistant backpack system: The air deflector back panel design allows the air to flow freely and keeps the back dry at all times. The back is thickened with pearl cotton, which can decompress and resist earthquakes, USB charging: The backpack has a built-in charging data cable and an external charging port; the mobile phone can continue to be used., Function and safety: The design of the trolley case fixing belt can release the shoulder pressure with the trolley case, and there is no burden on long-distance travel!, Multi-function carrying method: The bag is designed to be hand-held and double-backed, with a variety of carrying methods. Every detail of a fashionable backpack, the incomparable design spirit is the secret that people are crazy about