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
https://scontent-sea1-1.xx.fbcdn.net...c5&oe=58E001D6
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.
https://scontent-sea1-1.xx.fbcdn.net...78&oe=591D571B
Popped the plastic off my spare car key and punched a hole in it. All keys in the leather fob now.
https://scontent-sea1-1.xx.fbcdn.net...57&oe=58E13CD1
Nice and thin and easy on the pockets
https://scontent-sea1-1.xx.fbcdn.net...47&oe=58D98667
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.