Publication 52 - Hazardous, Restricted, and Perishable Mail > Appendix C > USPS Packaging Instruction 10A 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. |