A few years ago I discovered the Traveler’s Notebook while perusing Etsy. After deciding to go with the classic Midori size I had a blast finding inserts. After some time, it made sense to add one more size to my collection. The A5 size works a little better for longer travels while the Midori meets my daily needs and serves me well on shorter trips.
I like having items that can serve multiple purposes. It satisfies my need to simplify and to use less space.