USPS Packaging Instruction 10A

Small Quantity Provision

Some types of hazardous materials, as permitted in 336 and 49 CFR 173.4, may be prepared for mailing using the “small quantity” provision. The small quantity provision, like the ORM–D materials category, is unique within the United States, and its use is prohibited in international and APO/FPO/DPO mail.

Proper Shipping Name and ID Number

• Not applicable.

Prototype Testing Requirement

• The complete mailing package must be capable of withstanding the test criteria in 49 CFR 173.4(a)(6).

Mailability

• International Mail: Prohibited.
• Domestic Mail: Permitted via surface transportation only.

Required Packaging

Inner Receptacle

• Each inner receptacle cannot be liquid–full at 131° F (55° C).
• Each inner receptacle must be constructed of plastic with a minimum thickness of no less than 0.2 mm (0.008 inch) or must be made of earthenware, glass, or metal.
• Each inner receptacle must be securely sealed with wire, tape, or other positive means.

Absorbent and Cushioning Material

• Sufficient absorbent material that will not react chemically with the hazardous material must fully surround each inner receptacle and be capable of absorbing the entire liquid contents of the inner receptacle(s) in case of leakage.
• Each primary receptacle must be surrounded by sufficient cushioning material to absorb shock and prevent breakage.
• The absorbent and cushioning materials used must not violate 49 CFR 173.21.

Secondary Packaging

• Each inner receptacle and the absorbent cushioning material must be placed within a securely sealed secondary packaging.

Outer Packaging

• The secondary packaging must be securely packed in a strong outer packaging.
• The total weight of each mailpiece must not exceed 64 pounds (29 kg).

Marking

• The address side of each mailpiece sent under the small quantity provision must be clearly marked with “This package conforms to 49 CFR 173.4 for domestic highway or rail transport only.”
• A complete return address and delivery address must be used.