# Environmentally hazardous substances — Postal shipping restrictions by item category

For Environmentally hazardous substances, carrier is Royal Mail / Parcelforce; restriction type is restricted; scope is UK (Post Office counter); conditions is Samples must not exceed 5 litres/5kg; pack in a leak proof or sift proof inner protected by cushioning material in rigid outer packaging, recorded from its source on 2026-08-10.

- **Item category:** Environmentally hazardous substances _(verified: appears in the quote below)_
- **Carrier:** Royal Mail / Parcelforce _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** UK (Post Office counter) _(our reading, not quoted from the source)_
- **Conditions:** Samples must not exceed 5 litres/5kg; pack in a leak proof or sift proof inner protected by cushioning material in rigid outer packaging. _(verified: appears in the quote below)_

## What the source says

> Packaging Guidelines: Samples must not exceed 5litres/5kgs. Pack in a leak proof or sift proof inner and protect by cushioning material in rigid outer packaging.

## Source

- https://corporate.postoffice.co.uk/media/w5dlus1c/foia-response_foi2025_00179_appendix-d_rm-dangerous-goods-and-prohibited-and-restricted.pdf

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/).