# Pesticides, insecticides, herbicides with oral LD50 greater than 300 mg/kg (nonregulated) — Postal shipping restrictions by item category

For Pesticides, insecticides, herbicides with oral LD50 greater than 300 mg/kg (nonregulated), carrier is USPS; restriction type is restricted; scope is all domestic mail; conditions is Mailable but must be packaged in rigid outer packaging per 339.4 and able to withstand normal transit; liquids must also follow 451.3(a), recorded from its source on 2026-08-04.

- **Item category:** Pesticides, insecticides, herbicides with oral LD50 greater than 300 mg/kg (nonregulated) _(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:** all domestic mail _(our reading, not quoted from the source)_
- **Conditions:** Mailable but must be packaged in rigid outer packaging per 339.4 and able to withstand normal transit; liquids must also follow 451.3(a) _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Liquids and solids such as pesticides, insecticides, herbicides, and irritating material ( 346.11 (b) ), that do not meet the classification criteria of a hazardous material per 49 CFR § 172.101 with an oral LD50 value greater than 300 mg/kg are mailable but must be packaged in rigid outer packaging

## Source

- https://pe.usps.com/text/pub52/pub52c3_025.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/).