Individual mailpieces aggregated into a unit such as a bundle, tray, or sack. Units can also be aggregated within another unit such as bundles within a sack or trays on a pallet. The nesting of mailpieces with Intelligent Mail barcodes using unique IDs allows the tracking of the pieces in the containers if the containers also bear unique barcodes. Nesting mail with unique barcodes creates visibility of the mail.
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