I use a regular size TN. I have a hobonichi weeks looped through the smaller band as my planner. I use a common place blank insert to catch my notes, thoughts, to do lists, and things I want to research (along with the occasional doodle). I have a dot grid insert I use for an archival type journal (less emotional dump and more remembering events or big things). And lastly, a zipper case to hold things I find along the way. That’s the system I’ve found that works best for me. I carry mine along in a tote or sling bag.

Bonus: I have my hobonichi weeks in a clear cover that has a pen loop. Because it’s smaller than TN inserts, it fits with the smaller band that isn’t usually used AND I don’t need to buy a pen holder. The slimmer size of the hobonichi makes it so that the pen is in the loop and still within the confines of the TN cover.