This is the Day Pack 2, a standard model from the popular brand Aer. Retail price: ¥29,700 (tax included). With its simple and sophisticated design, this model can be used for a wide range of purposes, from business to personal use. It can hold A4 files and a 15.6-inch laptop, making it ideal for commuting, going to school, and business trips. ◆Product Details • Brand: Aer / Aer • Model Number: Day Pack 2 (31009) • Color: Black • Size: W305 x H430 x D140 mm • Weight: Approximately 1300g • Capacity: Approximately 14.8L • Storage Size: A4 files, 15.6-inch PC compatible • Material: 840D nylon (carbonate polyurethane coating), 1680D Cordura ballistic nylon I used this for commuting to the office for about a year (2 days a week). I am selling it because I no longer use it. The inside is relatively clean, but there is some deterioration of the surface material. It is still in a condition where it can be used, so please consider it.