Muji's lightweight and durable nylon mesh bag-in-bag. It's a vertical type that makes it easy to put in and take out A4-size notebooks and clear files. External dimensions: Approximately 34 x 27 x 3 cm (official information) I bought it at a store about two years ago and used it about three times in a backpack, but I've been storing it folded since then. ⚠️ Therefore, there is a crease in the shape of an inverted V. ⚠️ There are some black spots on the bottom. I don't remember storing a ballpoint pen, so I don't think it's ink stains. I tried to remove them, but I couldn't. I will sell it as is because I don't want to make a hole by trying to remove them. I will sell it to those who can understand. When shipping, I will fold it in half at the crease. I will wrap it in a zipper bag and ship it in a box-shaped envelope or a plastic bag. I cannot offer a significant discount. I may change the shipping method to Rakuraku Mercari.