**UPDATE, 9/30/13, Instructions for making this book are now available on Etsy. Thanks to everyone for the support and interest in this book structure!**
I made this book specifically to store all of the bills I get in the mail. Before I had a drawer stuffed with a year's worth of gas, electric, and insurance bills because I had no other place to put them. Now I have an envelope for each type of bill/statement, and I can clean out that drawer. I ended up with a bag of envelopes and other unnecessary papers that can be recycled. And the accordion spine means the book can expand as I add this year's bills to it.