Get the word out, and get the word back! #9 envelopes are sized at 3 7/8 x 8 7/8 and fit neatly in a standard #10 letter. This makes them especially useful for business replies, donation drives, invoices, RSVP forms, membership renewals, and any case where you want a reply to what you send. #9 Envelopes! Available locally in Winston-Salem, from Freedom Creative Solutions.