Now if you are wondering why I made another given that Big'un looks exactly the same as Littl'un then think again:
I wanted to be able to get a 12x12 box (which is actually slightly bigger than 12x12) inside. In fact I wanted to be able to get 2 boxes in. I also wanted to put a double thickness interfaced pocket inside so I did:
May well do more of these. What for I know not but does that matter?