The telescopic extending mailer is another creative direct mail piece that conveys a large amount of information, you pull the first piece and the mailer expands to 3 or 4 times the original size, revealing product information on both sides. The extending mailer can be supplied with stepped thumbcuts, this ensures that no part of your marketing message is missed. The most popular sizes of this direct mail idea are A6 and DL, they expand with between 3 and 5 extra panels. We will happily produce bespoke sizes but this is not a mail piece where bigger is better.