# Hazardous Materials (HAZMAT) — Postal shipping restrictions by item category

For Hazardous Materials (HAZMAT), carrier is USPS; restriction type is restricted; scope is domestic; conditions is Some HAZMAT can only be sent by ground transportation—it can’t go on airplanes, recorded from its source on 2026-08-03.

- **Item category:** Hazardous Materials (HAZMAT) _(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 _(our reading, not quoted from the source)_
- **Conditions:** Some HAZMAT can only be sent by ground transportation—it can’t go on airplanes.

## What the source says

> Some HAZMAT can only be sent by ground transportation—it can’t go on airplanes.

## Source

- https://www.usps.com/ship/shipping-restrictions.htm

Last verified: 2026-08-03. Review by: 2027-08-03.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).