There are a number of other solutions if you are missing any of the features, but not all three with pocket, elastic band and pen holder.
Then you can buy either self-adhesive pockets and paste in. We have a large amount of pen holder in different colors and designs. Among these is a model that also has a elastic band with pen holder Nuuna also has its anti-handbag model, the purpose of which is to keep the book closed with extra features mobile phone and pen holder.