USPS Homepage

USPS Packaging Instruction 4A

Flammable Solids

A flammable solid that can qualify as a mailable limited quantity or ORM-D material is permitted in the domestic mail via surface transportation only, provided all applicable requirements in 344 are met.

Proper Shipping Name

ID Number

Mailability

Required Packaging

Primary Receptacle
Cushioning Material
Outer Packaging
Marking