This product was designed to be used with a 9 X 12 envelope. I like to use the white ones but manila will work as well. I glue the full page sheet on the front. The pieces are cut out so the children are able to match the pieces. Pieces can be stored inside the envelope. I suggest laminating the envelope open and then making a slit at the opening so you can drop the pieces inside. I dislike File folder activities because the pieces are easily lost. This is a great alternative! If a piece gets left behind, you will know exactly where it goes by looking on the front of the envelope.
These envelope packets are great for early finishers, RTII, or dessert. The children can practice skills without completing a worksheet! My firsties think of these as games. :)