USPS Packaging Instruction 6A

Toxic Substances

A Division 6.1 toxic substance that qualifies as a Limited Quantity material within the Postal Service is permitted in the domestic mail via air or surface transportation when all applicable requirements in 346 are met.

Proper Shipping Name

ID Number


Required Packaging

Primary Receptacle
Absorbent and Cushioning Material
Outer Shipping Container

The following labels and text markings must be placed on the address side of the mailpiece unless specified in 221.1 and 325.1.