These little notebooks are awesome. They fit PERFECTLY in the back pocket of the Lucky Life Planner.It's useful to keep a slim notebook for notes and journaling, so I don't fill up my planner with random stuff. I want my planner mainly focused on goals, plans, tasks, and useful info. Notebooks are replaceable throughout the year, so I can use them for anything!Some days when the planner is too bulk to carry, and I have a small backpack or pocketbook I’m carrying, I just take the notebook. I use it as a temporary replacement for my planner because it has a monthly calendar spread to enter my current schedule, plus a yearly page for any long-term plans.All in all, a super useful notebook with a twist: - a planner / notes hybrid product concept that I haven't seen before. And a beautiful color selection! Love it!