isshoni. Synthetic Leather Pen Case Notebook Cover B6 / DAIGOThe isshoni. Pen Case Notebook Cover by DAIGO combines a B6 notebook cover with an integrated pen case for carrying your notebook or planner and stationery together. The synthetic leather cover includes a magnetic clasp front pocket for documents and sticky notes, a gusseted pen case section that holds about 10 pens, and a business card pocket for meetings. The cover accommodates one notebook inserted on either side, or two thin notebooks