Cup Connector / Mug Holder

I got a thermos. It came with extra cups. The cups do not connect to each other or stack in any usable way.

So, I created this little sleeve-type thing to connect the cups to the thermos. I need to tweak it because right now it requires a rubber band to stay secure, but the connectors worked out fantastic.

Do with this what you will, it's pretty specific to my needs.