# Liquid nitrogen in a dry shipper — Postal shipping restrictions by item category

For Liquid nitrogen in a dry shipper, carrier is FAA (air transport); restriction type is allowed; scope is carry-on and checked baggage; conditions is A dry shipper is an insulated cryogenic flask that contains refrigerated liquid nitrogen absorbed into a porous lining, used to transport specimens, recorded from its source on 2026-08-10.

- **Item category:** Liquid nitrogen in a dry shipper _(verified: appears in the quote below)_
- **Carrier:** FAA (air transport) _(our reading, not quoted from the source)_
- **Restriction type:** allowed _(our reading, not quoted from the source)_
- **Scope:** carry-on and checked baggage _(our reading, not quoted from the source)_
- **Conditions:** A dry shipper is an insulated cryogenic flask that contains refrigerated liquid nitrogen absorbed into a porous lining, used to transport specimens. _(verified: appears in the quote below)_

## What the source says

> A dry shipper is an insulated cryogenic flask/container that contains refrigerated liquid nitrogen absorbed into a porous lining. It is used to transport specimens.

## 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/).