This the the Bakers Box from Green Sneakers Templates, it can be made into 27 different sizes...WOW. I have made mine 6 x 4 1/2, it will hold four CAS cards and envelopes perfectly. I made a set of CAS Christmas cards to fit inside, a great gift! You can see them here... http://www.greensneakers.com/BoxTemplates/
You can read our full Splitcoast Product Focus review for the Kreate-a-box Templates HERE.