Ok - how do you fold the sides so perfectly? When I had ordered my 2 X 3.5, the flaps came all ready to fold. I bought a 3 X 7 sheet on Monday from a local sign shop and when I tried to fold the sides to make flaps, it was quite difficult. I finally got the sides to fold, but they are very uneven and look rather messy. It will work for now, but I'm looking to buy a more colorful piece of cloroplast in the future (all they had was white and I had four piggies waiting on the cage at home). Any suggestions?