Sanwa Supply Gusset Expansion PC Bag Inch Wide (15.6 Black) BAG-W4BK

Comes with a gusset expansion function that expands the entire gusset by approximately 6 cm, making it compatible with large capacity. You can easily store lunch boxes and plastic bottles. The computer pocket uses thick cushioning. The front pocket is equipped with a pen holder, cell phone pocket, etc. Comes with a carry supporter that can be passed through the carry handle.