This is the TREKKER DOLOMITI series DLM30 top case for motorcycles. This top case is incredibly expensive, costing around 60,000 yen if you were to buy it new. (^◇^;) I no longer need it because I switched to a motorcycle with a top case already installed. The inside is bare aluminum, so if you leave it as is, the contents will rattle around and make a lot of noise. I've lined the inside with urethane sheets and cushion flooring to reduce the noise when the contents shift. This significantly reduces the noise. They are only fitted in, so you can remove them anytime if you don't like them, and you can arrange them as you wish. It's 30 liters, so a helmet won't fit. It's probably perfect for those who want a modest top case, such as for an American motorcycle.