This is MercuryTactical Gear, an American military and outdoor brand. I received it from a colleague who is retiring. This military gear brand has a track record of supplying the US military and offers a wide range of durable tactical equipment, including backpacks, carry bags (sea bags), utility pouches, and system notebooks. In Japan, as US military surplus, these items are often distributed as "surplus goods" from US military bases, such as those in Okinawa, and are popular among survival game (airsoft) enthusiasts and those who enjoy military fashion. ・Size Height: 50cm Width: 35cm Depth: 20cm Capacity: Approximately 35-50L *Please note that these measurements are approximate. It has been cleaned, but there is a general feeling of use. In particular, there are scratches and stains on the outside of the backpack in various places. Please check photos 19 and 20. There may be other overlooked stains. Please purchase only if you understand that this is a used item. *I am selling two of the same item. The appearance, size, and dimensions are the same, and I am using the same photos, so please understand. If you have any questions about the product, please feel free to ask. Instant purchase is OK. I would like to ship it in a size-appropriate package, such as a paper bag or cardboard box.