What You Should Know About
USPS Shipping Restrictions in 2025

Let’s face it – shipping can be a logistical minefield. And when it comes to mailing something through the USPS, it’s not just about getting your package from Point A to Point B. There’s a whole rulebook filled with “can’ts,” “maybes,” and “only ifs.” Especially now in 2025, when shipping laws, safety concerns, and e-commerce innovations have changed the game yet again.

Whether you're a business trying to fulfill nationwide orders or someone who just wants to send grandma a bottle of perfume, USPS shipping restrictions can catch you off guard. Don’t worry – we’ve put together a full rundown of what you can and can’t ship, what’s changed this year, and how to make sure your packages don’t get rejected, delayed, or destroyed.

Let’s dive into the ever-evolving world of USPS shipping policy and how to stay on the right side of it in 2025.

USPS still handles more package deliveries than any other service in the U.S. Even shipping giants like UPS and FedEx continue to rely on USPS for last-mile delivery in many regions.

But with great volume comes great responsibility – and a lot of rules. USPS shipping restrictions exist primarily to keep the mail system safe and compliant with U.S. laws and international treaties.

Some items are totally banned, others are allowed with restrictions, and many require special handling. Here’s what you need to know.

Restricted items aren’t flat-out banned – but they do require careful handling, documentation, or routing through specific USPS services. Some can only be shipped within the U.S. Others may only be shipped by ground transportation or in limited quantities.

Here’s a list of common USPS package restrictions in 2025:

Many of these items are subject to USPS shipping policy updates, so if you're shipping them regularly, it’s wise to check the most current postal bulletins.

Some items are strictly off-limits. These cannot be sent through USPS under any circumstances, no matter the packaging or purpose:

Despite growing state-level acceptance of cannabis products, USPS still classifies marijuana – medical or recreational – as prohibited, and attempting to ship it can result in felony charges under federal law. Yes, even in 2025.

Shipping within the U.S. comes with fewer hurdles compared to international packages, but you’re not entirely off the hook.

Perfumes and nail polish containing alcohol? Ground shipping only. Lithium batteries? Only if properly marked and below certain thresholds. Prescription meds? Only from registered entities.

In short, USPS domestic shipping restrictions make allowances but still follow the rules.

If you think you can just shove your item in a box and call it a day – think again. USPS has strict guidelines on the dimensions and weight of packages.

Here's what you're working with in 2025:

For USPS Retail Ground (often used for oversized or heavier shipments), the max girth jumps to 130 inches, but an extra fee will apply.

Media Mail is the go-to for shipping books and other educational materials on a budget – but it comes with clear limitations.

Eligible items include:

Still not allowed: Video games, USB drives, and anything containing ads or promotional material. USPS continues to enforce random checks, so misusing Media Mail can cost you.

Let’s break this down:

Priority Mail remains one of the most flexible and fastest domestic options – but don't expect it to save your oversized, awkwardly shaped package.

While Flat Rate boxes are popular for their simplicity, they don’t give you a free pass. You’re still subject to USPS package restrictions:

Size options range from small padded envelopes to large APO/FPO Flat Rate boxes. Just remember – if it fits, it ships… as long as it’s allowed.

Shipping liquids in 2025? Here’s how to do it safely:

Make sure to label the package clearly and declare contents. USPS liquid restrictions are among the most commonly misunderstood, so don’t take shortcuts.

Shipping to military addresses (APO/FPO/DPO) follows specific USPS APO restrictions:

Delivery may take longer depending on the location, so packaging for durability is a must.

USPS has set international size limits, though they vary by country. In general:

Pro tip: Always check the USPS international shipping restrictions by country before sending anything. Some countries refuse items like used clothing or electronics altogether.

Some places are trickier to ship to. As of 2025, here are USPS restricted countries requiring federal licenses or extra scrutiny:

Even with a license, your package might still be rejected due to diplomatic tensions.

Here’s what’s globally banned through USPS:

Many of these mirror domestic restrictions, but enforcement abroad can be even stricter. Check the USPS country index before shipping internationally.

In 2025, USPS has rolled out several changes that impact how restrictions are enforced:

Also worth noting: USPS now offers an optional service to pre-screen packages for restricted contents via certified drop-off locations.

Using Calcurates? Setting up USPS restrictions is easier than ever:

Whether you're on Shopify, Magento, or WooCommerce, Calcurates helps you stay compliant and avoid nasty surprises.

Shipping with USPS in 2025 is more secure and tech-driven than ever – but also more complex. Regulations around what you can ship, where you can send it, and how you package it continue to evolve. By staying up to date with USPS shipping restrictions, knowing your USPS size restrictions, and understanding country-specific prohibitions, you’ll save yourself from fines, delays, or lost packages.

So before you slap that label on your box – double-check the rules. Because in the world of logistics, a little prep goes a long way.