USPS Packaging Instruction 10A

Small-Quantity Provision

Some types of hazardous materials, as permitted in 338 and 49 CFR 173.4, may be prepared for mailing using the “small-quantity” provision. The small-quantity provision is unique within the United States, and its use is prohibited in international and APO/FPO/DPO mail.

Proper Shipping Name and ID Number

Prototype Testing Requirement


Required Packaging

Inner Receptacle
Absorbent and Cushioning Material
Secondary Packaging
Outer Packaging