# Small compressed gas cylinders and cartridges in or with a device (CO2) — Postal shipping restrictions by item category

For Small compressed gas cylinders and cartridges in or with a device (CO2), carrier is FAA (air transport); restriction type is restricted; scope is checked baggage only; not allowed in carry-on; conditions is Up to four cartridges/cylinders of nonflammable gas; each must not exceed 50 ml (equivalent to a 28 g CO2 cartridge); larger cylinders are forbidden unless covered by another exception, recorded from its source on 2026-08-10.

- **Item category:** Small compressed gas cylinders and cartridges in or with a device (CO2) _(verified: appears in the quote below)_
- **Carrier:** FAA (air transport) _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** checked baggage only; not allowed in carry-on _(our reading, not quoted from the source)_
- **Conditions:** Up to four cartridges/cylinders of nonflammable gas; each must not exceed 50 ml (equivalent to a 28 g CO2 cartridge); larger cylinders are forbidden unless covered by another exception. _(verified: appears in the quote below)_

## What the source says

> Up to four cartridges/cylinders containing nonflammable gas may be carried. Each cylinder must not exceed 50 ml (equivalent to 28 g carbon dioxide cartridge).

## Source

- https://www.faa.gov/hazmat/packsafe/printable-chart

Last verified: 2026-08-10. Review by: 2027-08-10.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).