Cavity Card - Carry coins & keys in a slim wallet!

I love my minimal wallet.

However, living in Europe, it's hard to go coinless (believe me, I've tried...). Cavity Card helps carry a few coins in your minimal wallet while keeping it light and slim.
I got my first "minimal wallet" in 2014.
For a few months I tried using cards and bills only. However, living in the Netherlands, coins are still quite frequently needed (parking, vending machines, public toilets, etc).  
That's when I started thinking: "How can I carry some coins, while keeping my wallet as slim as possible?" 
After trying a couple of things, I 3D printed the first version of Cavity Card. Only after a couple of friends and colleagues started asking where I bought it, I decided to start selling them too. 


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