This is a Tegner adjuster seat bag, priced at 19,800 yen. The dimensions are: height 43cm, width 54cm, and depth 29-41cm. Capacity is 18-34 liters, and it's expandable. Accessories include a rain cover, four adjustment belts, and an adjustment base. The instruction manual is included inside the bag. Please note that the underside of the adjustment base has undergone hydrolysis and is peeling. Please refer to the photos. Other than that, it's in good condition. It's still usable, so I hope someone who likes it will use it. Thank you.