Some have pockets and pen holders on the inside. Please judge from the photos. Size: Approximately 22.5 x 15.5 cm You can use it as a notebook if the size fits. I think it's about the size of a paperback book. The three on the right are not very dirty. The two on the left have stains on the inside. Slightly warped from storage. Please understand that these are used items and examine the photos carefully before purchasing. Thank you.