Some quick pictures I took this morning. Excuse the quality. I used what hardware I had on hand to get the point across. There are a couple of post sizes that will come with the production model, allowing for more keys to be stacked.
My everyday keys
The keys in the new fob. I attached the car key to the hanger. It will fit inside, but I don't like the thick plastic.
Popped the plastic off my spare car key and punched a hole in it. All keys in the leather fob now.
Nice and thin and easy on the pockets
So, if you have looked at the campaign, you will see this is to be a streamlined alternative to some of the tech type fobs that can hold a ton of toys. While this could as well, it is not the original intention. It won't work for everyone. With the largest post, it could hold the equivalent of 5-6 keys on each side.