USPS Packaging Instruction 1A

Toy Propellant Devices

The proper shipping name for a mailable toy propellant device is “model rocket motor” or “igniter.” A device that is assigned identification number NA0323 or UN0454 and classed as a Division 1.4S explosive is eligible for mailing in domestic mail via surface transportation only, provided that all requirements are met and the device is properly packaged as follows.

Proper Shipping Name and ID Number

Required Authorization

Prior written permission must be obtained from:

DIRECTOR, Product Classification
USPS Headquarters
475 L’Enfant Plaza SW, Room 4446
Washington, DC 20260


Design Specifications

Mailable devices must meet each of the following conditions:

Required Packaging

Primary Receptacle
Outer Shipping Container

Note: Full responsibility rests with the mailer to comply with Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE) regulations before mailing. At the time of mailing, the mailer must present to the Postal Service acceptance clerk a legible photocopy of the Product Classification director’s approval letter.