# nonhazardous liquids — Postal shipping restrictions by item category

For nonhazardous liquids, carrier is USPS; restriction type is allowed; scope is domestic mail; conditions is Liquids that are nonhazardous are mailable provided they are properly packaged, recorded from its source on 2026-08-04.

- **Item category:** nonhazardous liquids _(unconfirmed — we could not tie this to the quote below)_
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** allowed _(our reading, not quoted from the source)_
- **Scope:** domestic mail _(our reading, not quoted from the source)_
- **Conditions:** Liquids that are nonhazardous are mailable provided they are properly packaged

## What the source says

> Liquids that are nonhazardous (i.e., not regulated as hazardous materials) are mailable provided they are properly packaged as specified in 451.3

## Source

- https://pe.usps.com/text/pub52/pub52c4_018.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/).