Pouchette envelopes open and close like a petal flower. The flaps are available in pointed and round. These are specialty envelopes and are custom made to order. The sizes range from 5x7 up to 5.5x8.5.  Square sizes range from 5x5 to 7x7. Custom sizes can also be converted. Cardstocks in mattes, metallics and even translucents are available for your choosing.