You can tuck a page you'd like to come back to into the elastic band so you can easily open to it again.
Can be used by attaching it to a cover with a butterfly stopper. Attach it to the inside pocket at the bottom right corner of the cover, and use the elastic band to hold your place on the page you want to open.
* The listing is for one keeper shown in the first photo. Other photos may show other items that are not included for demonstration purposes only.
