Notebooks and analogical calendars have been more and more succesful in past few years. Notebook is easy to carry with you and as suprising as it is, its much faster to make notes to analogical notebook than digital version. As it's analogical, it also doesn't have annoying notifications that piip and vibrate all the time.
In past few years Bullet Journaling or BuJo has been in a key role in bringing notebooks back to prime. We highly recommend checking the system out. We got just the right notebook for Bullet Journal and several books in different sizes.