Size #A2 envelopes are the perfect sized envelopes for RSVP and announcement letters. The Supplies Shops carries size #A2 announcement envelopes in a wide variety of colors and materials to make your special announcement stand out. #A2 envelopes measure 4-3/8" x 5-3/4". You can find announcement envelopes whether you are looking for white, colorful, or white translucent. Shop and save with free shipping on all orders over $99.