A form, such as a mailing form, constructed on a single laminated sheet of standard paper size, which is printable by a single pass through a standard non-impact printer, and extendible to provide additional surface area for the form exceeding standard paper size. The extendible form can be adapted for use with mailing forms such as multi-part collated unit sets. The form is useful for providing a Customs Declaration and Dispatch Note having each part printable by a single pass through a non-impact printer.