Free Post-it-Note (pop-up) file

Well I went to Staples to pick up their brand of post-it-notes (Stickies) and found them sold out! And I am not surprised - they were on sale for 12 for $2. So I purchased the pop-up notes instead ($5 for 12) and decided that I needed to make a holder for them. So here is what I can up with:

I was able to get 2 holders on one sheet of paper, here's the layout.

I used small RE magnets to hold the holder closed.

 I turned under the edge of the upper portion in order to reinforce the holder on either side of the slot opening, you can see it in this picture.

 Download the MTC file here.