From Amazon
Lenovo B510 15.6 Inch Laptop Backpack Black - Laptop Bags (15.6 Inch Backpack, 15.6 Inch, 600 g, Black)
Technoworld PLC
Lenovo B510 39.6 cm (15.6') Backpack Black GX40Q75214
Athema Services
lenovo everyday backpack b510 - notebook carrying backpack - 15.6" gx4