The MD 2020 Diary Sticker Set allows you to stay organised using your existing notebook. For example, you can attach a month-long calendar sticker to the left page of your MD Notebook, then use the right page to keep a daily journal and repeat for the rest of the months. The set contains 16 sheets: 14 month-long calendars (from Dec. 2019 to Jan. 2021) and two year-long calendars (2020, 2021).
The MD Diary Sticker is made from MD Paper, so when you stick it to your MD Notebook, it all feels like it is still the same single notebook. It is also fountain pen and pencil friendly.