This is a hand-stitched genuine leather notebook cover for a Traveler's Notebook Passport size. It can hold a total of three notebooks: one in each of the left and right pockets, and one secured by the central elastic band. By using a connecting elastic band, you can store two notebooks in the center, so I think it can hold up to four notebooks in total. You can also fit more by using a zipper case or kraft file. It comes with an adjustable pen holder. In the photo, a uni-ball one P is inserted. It should be able to accommodate pens up to about 15mm in diameter. The outer leather is light brown vegetable-tanned leather, and the interior is black hill-dyed vegetable-tanned leather. The thread is black Vinymo, and the edges are burnished with Tokonole and edge finishing agent. Brown elastic is used in the center, resulting in a calm design. *This item is also listed on other sites. Please note that we may cancel your order if it sells out quickly on those sites.