I'm selling this because I don't use it. It's made of lightweight and durable nylon mesh fabric. It's sized to fit A4 notebooks and clear files. It's designed to be a vertical shape that easily fits into a backpack. External dimensions: Approximately 34 x 27 x 3 cm. It will be sent with simple packaging. Thank you for looking. #MUJI #NylonMeshBagInBag