This is the Wilkin LS BP 30 backpack from Columbia (コロンビア). I've only used it a few times, so it's in relatively good condition. Below is the product description from Amazon: Height: 48 cm x Width: 30 cm x Depth: 16 cm Rigidity and lightness are achieved by using rigid foam inside the back. It has a sleeve pocket inside the main body and an organizer pocket inside the front pocket. The chest and waist belts can be attached and detached depending on the situation. This model has a large capacity and excellent functionality, with a casual look that makes it suitable for a wide range of activities, from outdoor fields to travel and town use.