One of the reasons that I use a ring bound planner, despite the much wider variety of wire bound planners out there, is because I can add special sections to my ring bound planner.
Today, while ordering more ink for my printer, I added a list of Sizes to the Notes section of my planner.
I started with grabbing graph paper from my Dashboard.
Then, I added the words "Sizes" to my Notes index.
Next, I put the Sizes page at the back of my Notes section. Note the box around the word "Sizes," making it easier to find the document.
Some of the things I am tracking so far on this page include clothing sizes/brands (for socks, tank tops...anything you buy regularly), air filter size (so I can pick them up whenever they go on sale), and ink size for my printer.
Bonus pictures of the new dividers I made this morning, by simply tracing the old dividers, cutting them, and hole punching.
Let me know in the comments what you track on your Sizes page.
P.S. You can find out about new posts at Giftie Etcetera by signing up in the left column for email reminders each time that I post.