Use these inserts to inventory your Washi! At a glance you will be able to see what you have so you don't duplicate your tape (like that would be a bad thing?).
This download has two pages with the second page being only boxes. If you would like to see this insert in a different size, let me know and I'll see if I can't work it out.
PS - I ended up making the boxes a thinner weight than shown to your left.