i've designed my own planners for the past 4 or 5 years. the one i have that isn't decorated (i have one that stays on my desk and is my pretty planner) is in a personal size binder. below is a screenshot of my layout. it fits in my purse, and i bring it to appointments and stuff. it's basically my "stuff i have to remember" planner. i don't use it all the time, but if i have a really really busy week, it's helpful to be able to braindump into it and have it on hand.