# Dry ice — domestic air — Postal shipping restrictions by item category

For Dry ice, item category is Dry ice — domestic air; carrier is USPS; restriction type is restricted; scope is domestic mail via air transportation; conditions is Permitted in quantities of up to 5 pounds per mailpiece; must comply with Packaging Instruction 9A, recorded from its source on 2026-08-04.

- **Item category:** Dry ice — domestic air _(unconfirmed — we could not tie this to the quote below)_
- **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 _(our reading, not quoted from the source)_
- **Conditions:** Permitted in quantities of up to 5 pounds per mailpiece; must comply with Packaging Instruction 9A _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Domestic Mail via Air Transportation: Dry ice is permitted in quantities of up to 5 pounds per mailpiece.

## Source

- https://pe.usps.com/text/pub52/pub52c3_028.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/).