The sweetest hand drawn Sardine envelopes for wedding invitations, pen pals, or any mail worth jazzing up with a little charm. 25 Blank Envelopes with Sardine Drawing. Envelopes are 5.25 x 7.25 and will hold a 5x7 Card. These have already been tested through US mail, so no worries about the mailing aspect! Name and address on invite is NOT anyone’s real name or address, promise! Stamps are NOT included. All envelopes are copies of an original drawing, so each one will be identical.