# Combustible liquids — domestic surface — Postal shipping restrictions by item category

For Combustible liquids, item category is Combustible liquids — domestic surface; carrier is USPS; restriction type is restricted; scope is domestic mail via surface transportation; conditions is Mailable if qualify as Limited Quantity and consumer commodity materials and meet criteria; Packaging Instruction 3B must be followed, recorded from its source on 2026-08-04.

- **Item category:** Combustible liquids — domestic surface _(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 surface transportation _(our reading, not quoted from the source)_
- **Conditions:** Mailable if qualify as Limited Quantity and consumer commodity materials and meet criteria; Packaging Instruction 3B must be followed _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Domestic Mail via Surface Transportation: Combustible liquids are mailable if they qualify as Limited Quantity and consumer commodity materials

## Source

- https://pe.usps.com/text/pub52/pub52c3_022.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/).