One of the ways you can lower your postage costs while improving delivery service is to co-palletize your mail either in-house or through a logistics company. Tray-based Co-palletization, also known as “Co-Tray” mailing, supports deeper penetration into the postal system. Bypassing a number of postal processing steps allows you to benefit from greater postage discounts, better tracking and more consistent and timely delivery of your mailings.