Day Air: Next

: Used for urgent documents and single-piece shipments that do not have a specific weight.

: A tear-resistant container for shipments that need extra protection. Next Day Air

: Designed for a single-piece shipment of documents that must be rolled rather than folded, such as blueprints or posters. : Used for urgent documents and single-piece shipments

Depending on what you are sending, a "piece" for Next Day Air can be: Next Day Air