This is such an easy folded card, ideally suited when you have several messages you would like to insert, or perhaps lots of people who need to sign the card. I have not yet inserted sentiments/verses - was just too excited to share this card and no extra postage required as it fits into the standard 22cm x 11cm envelope!
Cut 28cm x 9cm card. Fold a front panel at 7cm. Cut another piece 21cm x 9cm. Fold a front panel at 7cm. Slip this piece into the first card and glue the two 7cm pieces together. You will then have the tri-fold card. Decorate as you desire.