Roughly classify documents, notebooks and more. Organize documents easily by just throwing them in. Simple structure with an elastic string and plastic sheets. File folders can be carried together. No.2582 and No.2572 are best for organizing them. Approximately 20 pieces of file folders can be stored. *Provided that 10 sheets of paper in each. An elastic string adjusts to the optimum thickness. No.2582 and No.2572 can store thick booklets or notebooks by the flexibility of an elastic string. *Only for A4 size ones. Useful 2 index tabs inside. Roughly organize documents with index tabs.