I am so happy in my Hobonichi Cousin with my red Van der Spek Janet Leather cover that I ordered a 2018 one. Because it is much cheaper to buy the planner with a cover AND you get free bonus items with it, I bought a cover as well as the planner. I can switch to it at a much later date or sell it if I am unable to move out of my Janet Leather cover.
This is the one I fell for out of all the Hobonichi covers this year. It is the Mitsuhiko Sasao ‘My Favorite Table’ and comes in both A5 and A6 versions. One major selling point is that it has the outside slip pocket I have always liked.
Here is the A5 version
Here is the A6 version
I really am enjoying using my Cousin. The four calendars (yearly, monthly, weekly and daily) are perfect for me. I could never do this in a ring bound planner with normal paper because of the bulk and the weight.