# Methane, compressed or Natural gas, compressed (with high methane content) · USPS — Mailing and air-carriage restrictions by item category

For Methane, compressed or Natural gas, compressed (with high methane content) · USPS, item category is Methane, compressed or Natural gas, compressed (with high methane content); carrier is USPS; restriction type is restricted; scope is domestic mail: surface only (air prohibited); conditions is Hazard class 2.1, UN1971, packing group n/a; domestic mail air: Prohibited; domestic mail surface: 2A, recorded from its source on 2026-08-30.

- **Item category:** Methane, compressed or Natural gas, compressed (with high methane content) _(verified: appears in 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: surface only (air prohibited) _(our reading, not quoted from the source)_
- **Conditions:** Hazard class 2.1, UN1971, packing group n/a; domestic mail air: Prohibited; domestic mail surface: 2A

## What the source says

> Methane, compressed or Natural gas, compressed (with high methane content) 2.1 UN1971 n/a Prohibited 2A

## Source

- https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf

Last verified: 2026-08-30. Review by: 2027-08-30.
Part of [Mailing and air-carriage restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).