Navigating USPS Shipping Restrictions: 2025 Guide for eCommerce

Why USPS Shipping Restrictions Matter for eCommerce Businesses in 2025

USPS reaches every U.S. address, making it essential for eCommerce sellers targeting remote areas.

In 2025, new HS code requirements from September 1 enhance tariff compliance amid rising trade scrutiny.

California alone originates 10.7% of U.S. shipments, where state hazmat rules add layers to federal USPS restrictions.

Key 2025 USPS HS Code Changes for eCommerce Shippers

USPS mandates 2025 HTS codes starting September 1 for all international eCommerce shipments.

Accurate classification prevents delays and penalties from CBP inspections.

Source: CBP.gov. Check regularly for updates.

USPS Prohibited Items List 2025: What eCommerce Can't Ship

Prohibited items face total bans to ensure safety and legal compliance.

• Explosives and ammunition
• Marijuana and cannabis products
• Gasoline, flammable liquids
• Airbags and seatbelt pretensioners
• Radioactive materials

Ship these via approved carriers only; USPS rejects outright.

USPS Restricted Items: Rules for eCommerce Sellers

Restricted items require special packaging, labeling, or permits.

• Firearms: Registered mail only with ATF approval
• Liquids: Non-hazardous, screw-top sealed
• Cigarettes: Quantity limits, state taxes
• Lithium batteries: Under 100Wh domestic
• Knives: Mailable if not switchblades

2025 USPS Domestic Shipping Limits Table

Know exact size and weight limits to choose the right service.

Minimum parcel size: 6x3x1/4 inches.

How to Ship Liquids via USPS: 2025 eCommerce Guide

Follow these steps for safe liquids shipping under USPS restrictions.

1. Use screw caps with 1.5+ turns
2. Place in leakproof inner packaging
3. Cushion glass containers over 4 oz
4. Strong outer box with absorbent material
5. Avoid hazmat like corrosives or aerosols

USPS Media Mail and Priority Mail Rules for 2025

Media Mail suits books but has strict content limits for eCommerce.

• Allowed: Books (8+ pages), printed music, video discs
• Prohibited: Video games, computers, advertising

Priority Mail: 1-3 day delivery, Flat Rate boxes simplify eCommerce packing.

2025 USPS International Shipping Restrictions for eCommerce

No shipments to OFAC-sanctioned countries like Cuba, Iran, North Korea.

HS codes required post-Sep 1; declare accurately.

FAQ: Common USPS Shipping Restrictions Questions 2025

Quick answers to top eCommerce queries on USPS restrictions.

• What are 2025 USPS weight limits? Most services cap at 70 lbs; First-Class Mail at 13 oz.
• Can I ship liquids via USPS? Yes for non-hazardous with screw caps and cushioning.
• What items are USPS prohibited? Explosives, ammo, marijuana, gasoline, airbags.
• USPS international restrictions 2025? No OFAC-sanctioned countries; HS codes mandatory Sep 1.
• Media Mail rules? Books, music, videos only; no games or drives.
• Priority Mail size limits? 108 inches length + girth, 70 lbs max.
• Lithium battery rules? Domestic ok under 100Wh; international restricted.
• Avoid USPS fines? Declare accurately, check updates, use compliant packaging.
• California-specific rules? Standard USPS plus state hazmat; 10.7% of shipments from here.
• APO/FPO limits? Priority boxes up to 70 lbs; others 15 lbs max.

Resources for USPS Compliance

Stay ahead with tools like FreightAmigo for HS code checks and multi-carrier rates. Book a Demo or contact: HK +852 24671689, USA +1 337 361 2833, email enquiry@freightamigo.com.