# switchblade knife — Postal shipping restrictions by item category

For switchblade knife, carrier is USPS; restriction type is restricted; scope is all domestic mail; conditions is A switchblade knife features a blade that opens automatically by hand pressure applied to a button or other device on the handle, or through inertia, gravity, or both; mailable only to specific government and manufacturer recipients, recorded from its source on 2026-08-04.

- **Item category:** switchblade knife
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** all domestic mail _(our reading, not quoted from the source)_
- **Conditions:** A switchblade knife features a blade that opens automatically by hand pressure applied to a button or other device on the handle, or through inertia, gravity, or both; mailable only to specific government and manufacturer recipients _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> A switchblade knife features a blade that opens automatically by hand pressure applied to a button or other device on the handle, or through inertia, gravity, or both.

## Source

- https://pe.usps.com/text/pub52/pub52c4_014.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/).