Find A9 sized envelopes in many different styles, colors, and weights! We offer pointed flap and square flap which make perfect greeting card envelopes. Also, be sure to check out our foil lined envelopes! All A9 envelopes in this section measure 8 3/4" x 5 3/4". Great for fitting our 5 1/2" x 8 1/2" cards, including our greeting cards, single flat cards invitations, and jumbo postcards!