# Dry Ice (carbon dioxide solid) — Postal shipping restrictions by item category

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; conditions is 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, recorded from its source on 2026-08-04.

- **Item category:** Dry Ice (carbon dioxide solid)
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** Domestic Mail via Air Transportation (up to 5 pounds per mailpiece) or Surface Transportation; prohibited International _(our reading, not quoted from the source)_
- **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. _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> ps://pe.usps.com/text/pub52/pub52apxc_029.htm#ep1000804> 9A Dry Ice (Carbon Dioxide Solid) <https://pe.usps.com/text/pub52/pub52apxc_030.htm#ep1000830> 9B Magnetized Materials <https://pe.usps.com/text/pub52/pub52apxc_031.htm#ep1000862> 9C Miscellaneous Hazardous Materials <https://pe.usps.com/text/pub52/pub52apxc_032.htm#ep1000901> 9D Lithium Metal and Lith

## Source

- https://pe.usps.com/text/pub52/welcome.htm

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).