This is a bag-in-bag. I used it for a short time, and it's in good condition. I actually bought it for 3056 yen. ■ The contents of the bag are a pocket board that organizes your bag for easy use. It neatly stores small items in your bag that tend to get messy. ■ You can easily move it using the handle at the top of this product. From on-business to off-time, you can easily change bags as if you were changing clothes. ■ The "Bag Contents Square" is the smallest model in the series, but it's a model that can be organized smartly, such as by adopting an overflowing pocket that can store a plastic bottle. ■ As a small product to put only the necessary small items in the gaps of your bag, we have combined large and small pockets on both sides for storage. Although small, it is a versatile product that can be widely used from B4-sized bags to A4-sized bags, as well as backpacks and tote bags. ■ With 9 large and small pockets with flaps, zippers, and elastic belts, you can store various sizes of items, from business accessories to everyday life accessories. Material/Material: Polyester / Polyethylene Size/Dimensions: 250mm wide x 250mm high x 65mm wide Weight: 237g