USPS Prohibited Items List That Surprises Most Senders
- 01. USPS Prohibited Items and Fees: The Complete 2026 Guide
- 02. Complete List of USPS Prohibited Items
- 03. Domestically Prohibited Items (Cannot Ship Within U.S.)
- 04. Internationally Prohibited Items (Cannot Ship From U.S. Abroad)
- 05. USPS Fees for Restricted and Special Items
- 06. Restricted Items That Ship With Conditions
- 07. Domestic Restrictions (Allowed With Conditions)
- 08. Why These Restrictions Exist
- 09. Consequences of Mailing Prohibited Items
- 10. Penalties for Violations
- 11. International Shipping Special Rules
- 12. Key International Differences
- 13. Customs and Duties
- 14. How to Verify If You Can Ship an Item
- 15. Frequently Asked Questions About USPS Prohibited Items
- 16. Best Practices for Safe USPS Shipping
USPS Prohibited Items and Fees: The Complete 2026 Guide
The United States Postal Service strictly prohibits mailing ammunition, explosives, gasoline, airbags, and marijuana (including medical marijuana) both domestically and internationally, while charging a customs clearance fee of up to $19.75 on international packages where duties are collected. Shippers who knowingly mail prohibited items face civil penalties up to $25,000 and potential criminal charges under federal law, with the Postal Inspection Service intercepting over 1.2 million pieces of hazardous mail in fiscal year 2024 alone.
Complete List of USPS Prohibited Items
USPS maintains distinct prohibited item categories for domestic versus international shipping, with all domestic prohibitions also applying internationally plus additional restrictions.
Domestically Prohibited Items (Cannot Ship Within U.S.)
- Airbags - Contain explosive inflators that pose detonation risks during transport
- Alcoholic Beverages - Including wine, beer, and spirits (with very limited exceptions for licensed wineries)
- Ammunition - All types including primers, blank cartridges, and propellant powder
- Explosives - Fireworks, dynamite, blasting caps, and all pyrotechnic devices
- Gasoline - Including fuel containers and gasoline-powered equipment with residual fuel
- Marijuana - Medical or recreational marijuana, with exception for hemp-derived CBD under 0.3% THC not intended for cultivation
- Liquid Mercury - Including antique thermometers, blood pressure monitors, barometers, and fluorescent bulbs
Internationally Prohibited Items (Cannot Ship From U.S. Abroad)
These items are prohibited internationally even if they may be restricted but allowed domestically under specific conditions:
- Aerosols - Spray cans containing pressurized flammable contents
- Cigarettes and Vaping Products - Including e-cigarettes, e-cigars, and all components
- Dry Ice - Used as cooling agent but prohibited on international flights
- Fresh Fruits and Vegetables - Agricultural restrictions prevent pest introduction
- Lighters - All types including disposable and refillable lighters
- Nail Polish - Contains flammable acetone and other solvents
- Perfumes Containing Alcohol - Flammable liquid content exceeds safety limits
- Poisons - Toxic substances and hazardous chemicals
USPS Fees for Restricted and Special Items
While prohibited items cannot be shipped under any circumstances, USPS charges specific fees for restricted items and international customs processing that shippers must anticipate when planning shipments.
| Fee Type | Amount (2026) | When Applied | Refundable |
|---|---|---|---|
| Customs Clearance & Delivery Fee | $19.75 | International packages with dutiable items | No |
| Priority Mail Express | $28.95 | Overnight domestic delivery | Yes (if service failure) |
| Priority Mail (1-3 days) | $9.65 | Standard expedited domestic | No |
| First-Class Package | $5.00 | Packages under 16 oz | No |
| Registered Mail Insurance | No Charge | Up to $50,000 coverage | N/A |
| Import Duty Prepayment Service | $0.00 | Delivered Duty Paid (launched Feb 2026) | N/A |
The customs clearance fee is authorized by international postal agreements to reimburse USPS for costs incurred clearing items through customs and collecting duties at delivery time. This fee is collected from the addressee and is non-refundable even if U.S. Customs later refunds the duty.
Restricted Items That Ship With Conditions
Many household items appear safe but require strict packaging guidelines and quantity limits under USPS Publication 52.
Domestic Restrictions (Allowed With Conditions)
- Aerosols - Limited quantities, ground shipping only, proper marking required
- Lithium Batteries - Small batteries allowed with documentation; large e-bike/scooter batteries prohibited
- Firearms - Heavily regulated under Gun Control Act of 1968, adults only, specific packaging
- Hand Sanitizer - Alcohol content limits, ground shipping preferred
- CBD Products - Hemp-derived under 0.3% THC allowed with proper documentation
- Matches - Safety matches allowed; strike-anywhere matches prohibited
- Paint - Oil-based paint restricted, water-based allowed with quantity limits
- Perishable Items - Must not spoil during transit, proper packaging required
Why These Restrictions Exist
USPS prohibits hazardous materials to ensure postal employee safety and prevent catastrophic incidents during air and ground transportation. Mercury devices create toxic vapors if damaged, lithium batteries can ignite in cargo holds, and aerosols may explode under pressure changes. The Postal Inspection Service reported that 1.2 million pieces of hazardous mail were intercepted in FY2024, demonstrating the scale of compliance violations.
"Shippers knowingly mailing items that are prohibited or hazardous without proper documentation can be subject to penalty fines, cost of damages, and criminal charges".
Consequences of Mailing Prohibited Items
Violating USPS prohibited item regulations carries severe legal and financial consequences beyond simple package rejection.
Penalties for Violations
- Civil fines up to $25,000 per violation for knowingly mailing prohibited hazardous materials
- Criminal charges including felony charges for ammunition, explosives, or marijuana shipments
- Cost of damages if prohibited items cause injury, fire, or contamination during transport
- Shipping account suspension for repeat violators using commercial shipping platforms
- Package seizure and destruction without compensation to sender
Under federal law, mailing ammunition is illegal domestically and internationally, defined as material designed to be fired from pistols, rifles, shotguns, including primers and propellant powder.
International Shipping Special Rules
International shipments face stricter prohibitions than domestic mail due to customs regulations and aviation safety requirements.
Key International Differences
| Item | Domestic Status | International Status |
|---|---|---|
| Aerosols | Restricted (ground only) | Prohibited |
| Dry Ice | Restricted (limited quantity) | Prohibited |
| Nail Polish | Restricted (flam. limits) | Prohibited |
| Perfume (alcohol) | Restricted (quantity limits) | Prohibited |
| Cigarettes/Vapes | Restricted (age verification) | Prohibited |
| Fresh Produce | Allowed (perishable rules) | Prohibited |
USPS launched a new Delivered Duty Paid service in February 2026 with initially $0 fees to help shippers prepay import duties, though fees may increase in the future.
Customs and Duties
When international packages contain dutiable items, the addressee pays both the customs duty and the $19.75 USPS clearance fee upon delivery. Post Office facilities will not collect fees for items from overseas U.S. Post Office facilities (military) or items passed free of duty by Customs.
How to Verify If You Can Ship an Item
Before mailing any questionable item, follow this determination process to avoid violations:
- Check USPS Publication 52 (Hazardous, Restricted, and Perishable Mail) for official guidelines
- Determine if shipping domestically or internationally (rules differ significantly)
- Verify if item is fully prohibited, restricted, or allowed without conditions
- For restricted items, review packaging, quantity, and marking requirements
- Confirm whether ground-only shipping applies (no air transport)
- Consider declaring hazardous materials properly if allowed with documentation
- When in doubt, contact USPS Customer Service or visit Post Office for clarification
Frequently Asked Questions About USPS Prohibited Items
Best Practices for Safe USPS Shipping
To ensure your packages reach their destination without holds or seizures, verify all items against the prohibited list, use proper packaging for restricted items, declare hazardous materials when required, and choose ground shipping when air transport is prohibited. The USPS website provides the most current Publication 52 guidelines, which are updated regularly as safety regulations evolve.
Remember: when uncertain about an item's status, contact USPS directly before shipping. The cost of a quick verification call is far less than the $25,000 fine or criminal charges for violating prohibited item regulations.
Helpful tips and tricks for Usps Prohibited Items List That Surprises Most Senders
Can I ship marijuana through USPS?
No. Marijuana (including medical marijuana) is fully prohibited both domestically and internationally. The only exception is hemp-derived CBD products with less than 0.3% THC content that are not intended for cultivation, plus marijuana seeds.
What happens if I accidentally mail a prohibited item?
The package will be intercepted and seized by Postal Inspection Service. If you knowingly mailed it, you face fines up to $25,000 and potential criminal charges. Unknowing violations may result in package destruction without compensation.
Are lithium batteries prohibited by USPS?
Small lithium batteries are allowed with proper documentation and packaging, but large batteries for e-bikes, scooters, and electric cars are fully prohibited due to fire risk in cargo holds.
What is the USPS customs clearance fee?
The customs clearance and delivery fee is $19.75 for international packages where customs duty is collected. This fee is paid by the addressee and is non-refundable even if duty is later refunded.
Can I ship fireworks through USPS?
No. All fireworks are fully prohibited under federal law as explosive materials. This includes all consumer fireworks regardless of local legality, as they pose extreme hazards to air transportation.
Is nail polish prohibited by USPS?
Nail polish is restricted domestically (allowed with quantity limits and proper packaging) but fully prohibited internationally due to its flammable acetone content.
Can I ship alcohol through USPS?
Alcoholic beverages are prohibited domestically with very limited exceptions for licensed wineries under specific agreements. Alcohol is also prohibited internationally without exception.
What items are prohibited internationally but not domestically?
Key items include aerosols, dry ice, nail polish, alcohol perfumes, lighters, cigarettes/vapes, fresh fruits, vegetables, and poisons. All domestically prohibited items are also prohibited internationally, plus these additional restrictions.