Dry Ice (carbon dioxide solid) · USPS
What is the restriction type for Dry Ice (carbon dioxide solid) · USPS?
For Dry Ice (carbon dioxide solid), carrier is USPS; restriction type is restricted; scope is Domestic Mail via Air Transportation (up to 5 pounds per mailpiece) or Surface Transportation; prohibited International, recorded from its source on 2026-08-04.
349.32 Mailability Packages containing dry ice must be vented to allow the release of carbon dioxide gas and to comply with 49 CFR § 173.217 and 175.10(a)(10). Mailpieces containing dry ice are subject to the following conditions, as applicable: International Mail: Dry ice is prohibited. Domestic Mail via Air Transportation: Dry ice is permitted in quantities of up to 5 pounds per mailpiece. Mailpieces must comply with Packaging Instruction 9A in Appendix C, as applicable. Domestic Mail via Surface Transportation: Dry ice is permitted and must comply with Packaging Instruction 9A in Appendix C. Mailpieces prepared for surface transportation must not, under any circumstances, be routed via air transportation.
— pe.usps.com, retrieved 2026-08-04
- Item or substance
- Dry Ice (carbon dioxide solid) verified
- Carrier
- USPS our reading
- Restriction type
- restricted our reading
- Scope
- Domestic Mail via Air Transportation (up to 5 pounds per mailpiece) or Surface Transportation; prohibited International our reading
- Conditions
- Via air, permitted in quantities of up to 5 pounds per mailpiece. Must comply with Packaging Instruction 9A in Appendix C. Dry ice is prohibited in international mail.
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
Where each value comes from
The value above is stated away from the sentence quoted with the answer, so the passage that states it is shown here too.
Item or substance
349.31 Definition Dry ice (carbon dioxide solid)
— all from pe.usps.com, retrieved 2026-08-04
Source
- pe.usps.comhttps://pe.usps.com/text/pub52/pub52c3_028.htm