Folders often lend themselves to such attention-getting stunts even better than envelopes, for their size gives more room for illustration. In effect, they are advertisements sent through the mails, and they have to compete for their readers' interest in the same way as advertisements in a magazine. And their success or failure depends upon the same factors of attention-winning illustration and headline, interest-arousing start, clear description, logical argument and clincher, with coupon or card that makes ordering easy.
Something to keep in mind while writing
