As noted it does fit the big shot with the extended (long plates). However you need 13 inch product, so I used the Little Sizzles Mat Board 6x13inches for the basic form and am very happy with the result. You can use cardboard instead but then you need to reinforce the fold lines so they dont tear when folded. After cutting the form from heavier material, I was able to use the 12 inch paper to decorate the outside. So basically, you need not only the die but also the extended cutting plates and the mat board. I love the die. I give a lot of card sets as gifts especially to my family at CHristmas and this is a nice way to coordinate something to hold them. You can fit about 4 cards in the holder. Hope this helps you.