Coupons or other documents presented in a form suitable for mailing are disclosed in U.S. Pat. No. 443,141 (Kittredge) directed to a printed pamphlet including one or more coupons and mailing address information, and U.S. Pat. No. 1,415,596 (McKinnie) directed to an advertising or coupon device that can be folded into an envelope addressed to the customer.