This is a book band pen case to attach to your planner. * The elastic band with an adjuster can be adjusted to fit A5 and B6 size planners. * The mesh material allows you to see what's stored inside. * It has two pockets that are easy to sort by color and shape ☆ It's convenient for storing small items like sticky notes and correction tape separately. * You can easily carry the necessary items together, and it also prevents your planner from opening in your bag (^-^) It's a beautiful item as it has only been used a few times. For those who understand that it is used, thank you.