# Propane — Division 2.1 flammable gas — Postal shipping restrictions by item category

For Propane, item category is Propane — Division 2.1 flammable gas; carrier is USPS; restriction type is restricted; scope is domestic mail via surface transportation only; conditions is Mailable via surface transportation as Limited Quantity material only; air transportation is prohibited, recorded from its source on 2026-08-04.

- **Item category:** Propane — Division 2.1 flammable gas _(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 only _(our reading, not quoted from the source)_
- **Conditions:** Mailable via surface transportation as Limited Quantity material only; air transportation is prohibited

## What the source says

> Propane: Division 2.1 flammable gas. Propane is mailable via surface transportation as a Limited Quantity material only. Air transportation is prohibited.

## Source

- https://pe.usps.com/text/pub52/pub52c3_021.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/).