Envelopes are sized in Item Group A and designed to accommodate all Envelopments enclosures, scored stocks and cut stocks from Item Group B. Envelopments Paper Envelopes have a chevron-shaped flap and are available in a variety of paper colors. Paper Envelopes are available in 7 sizes. Self-sealing Crystal Clear Envelopes offer a transparent option that showcases the invitation or announcement inside. Pair them with Labels to make addressing easier. Crystal Clear Envelopes are available in 9 sizes.