Cut out your pieces. What ever size you would like. You can make them differnt sizes. Get some of the table cloth plastic ( I got mine from walmart. ) if I am thinking right I used 6 gage. Cut a hole just smaller than you want your window. And the plastic a bit bigger. Snip the corners of the fabric so that you can fold it in a bit. Lengthen your stitches as it perforated the plastic. You can use a big zig zag if desired. Place the plastic behind and sew around the whole. Rift sides together. Sew leaving a whole to turn. Turn and stuff with supplies. I kept a list of items for them to find. Or you can just leave them search. Sew up the hole. I also sewed all around the outside reinforcing the seam. I didn't want to chance anything escaping. Attach the list. If you need more Han that let me know.