PURPOSE: To utilize a groove opened on a central section of a bag, protect a notebook and a book, make use of a mouth of the bag with fastener and store things safely and securely by forming the groove on the front central section of the bag.

CONSTITUTION: A groove 3 is formed on a front face central section of a bag 1. For instance, the groove 3 is formed on the front face central section of the bag 1, and a fastener 2 is provided on a mouth of the bag 1. A ring fitting, a binder fitting, a file fitting, a paper holder, a clip or the like can be attached thereon in place of forming the groove 3. Covers on the front and rear faces of the notebook or the book can be stored in the bag 1 through the groove 3 by the arrangement, and the book can be used as a cover. Also important papers, memorandums or outdoor maps, writing tools and the like can be stored by utilizing the mouth with the fastener 2.