This is the "Coulee 40" from MYSTERY RANCH. I purchased it new for 31,900 yen and used it only once for a trip to my parents' house. I haven't used it in situations where I would sweat, such as hiking or other outdoor activities. There is almost no damage, and it is in very clean condition. The fabric is a matte, subdued material, unlike the current Coulee 40's shiny fabric. It has a good fit and conforms to the back, making it a functional backpack. From the official website: Key Features ・Stretch pockets on the front and sides of the pack ・Two zippered compartments in the top lid for organizing small items ・Two carry loops with retaining straps for attaching and carrying tools ・Compression straps on the sides of the pack to compress the load for stability and to secure accessories ・A padded waist belt with zippered pockets that fits the curves of the body ・Compatible with hydration packs Functions ・The main frame consists of two vertical composite rods and a horizontal composite bar at the top. Composite stays that cross horizontally maintain the position of the vertical rods while supporting pivoting and flexible shifting in response to movement, enabling stable carrying. In addition, an HDPE (high-density polyethylene) frame sheet, with two at the top and one at the bottom, reinforces the structure. The main frame, which utilizes patented technology and construction methods, shifts the load to the wings, distributes it evenly to the contact points, and transmits it to the waist belt. The waist belt fits comfortably around the waist, effectively transmitting and distributing the load to prevent slippage. ・The patented Futura Yoke allows for easy fine-tuning of the back length, providing an optimal fit between the back and the frame. ・Features a removable waist belt system. ・It features MYSTERY RANCH's signature 3-zip design, which opens wide for quick and easy access to your gear.