---
type: restriction
id: usps-combustible-liquids-domestic-air
asset: shipping-restrictions-by-class
title: "Combustible liquids — domestic air — Postal shipping restrictions by item category"
sources:
  - https://pe.usps.com/text/pub52/pub52c3_022.htm
source_quote: "Domestic Mail via Air Transportation: Combustible liquids are mailable if they qualify as ID8000 materials"
generated: true
harvested: 2026-08-04
stale_after: 2027-08-04
item_category: "Combustible liquids — domestic air"
carrier: "USPS"
restriction_type: "restricted"
scope: "domestic mail via air transportation"
conditions: "Mailable if qualify as ID8000 materials and meet criteria; Packaging Instruction 3B must be followed"
verified: false
unverified_fields: carrier, conditions, item_category
---
**Item category:** Combustible liquids — domestic air

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail via air transportation

**Conditions:** Mailable if qualify as ID8000 materials and meet criteria; Packaging Instruction 3B must be followed

> Domestic Mail via Air Transportation: Combustible liquids are mailable if they qualify as ID8000 materials

Source: <https://pe.usps.com/text/pub52/pub52c3_022.htm>