It's not just because I'm a lefty; spirals fall apart, catch on things, and are overly bulky. In fact, an annual planner is kind of a waste of space in my already full bag.
My solution is a system where each month is a separate book, which hooks together with other months to hold just as much time as you need at a time. 2 months, 3, 4... and when you're done with a month, you can unlock it from the group and put it away.

Here is an example of the 4 books, loose. Each book contains a month of information. The months are blank, so you can use them for whatever month you would like by simply marking the month, and the days on each page.

The books hook together through their binding to make one connected book with as many months as you want.

Here's an animation of several books being connected together. The flap slips through the binding of the month in front, and tucks back into itself.

The colored flap also serves as a bookmark to the current week.

The final page has an overview of 15 months for reference in setting up the blank book.
I have chosen to use three patterns of
Mod-Tone paper for the inside. Each book has a colored flap, and one coordinating paper. The following are three of the four papers.
2) Also, I am planning on designing medallions to letterpress on the front of each book. Each of the 4 medallions would be a decoration with a place for writing the month. Any ideas or inspiration would be appreciated.
3) I want to sell the books in sets of 4- which is a good opportunity to try them out to see if they work for you. Each set of 4 would come with a band to tie around your set. Anyone have any comments about the structure of the binding, and the rest?
Any comments are helpful, and again, thanks! I hope one day these will help someone else stay on track.