Shipping Marks Explained: What They Are, Types & Examples

A shipping mark is the identification printed on the outside of your cargo, and your supplier will ask for yours before production ends. For many first-time importers, that request comes with no explanation. This guide covers the meaning of shipping marks, the main types, what goes on cartons and pallets, and how to check them before shipment.

What Is a Shipping Mark? Meaning and Definition

A shipping mark is a set of words, numbers or symbols on the outer packaging of cargo. It shows who the goods belong to and where they are going, and it ties each carton, pallet or crate to your purchase order and shipping papers. Some people call it a ship mark, cargo mark or case mark. The meaning is the same: the identity of your cargo, readable without opening a box.
Picture a buyer importing hydraulic pumps and control valves from an overseas factory. By the time the goods reach Houston or Vancouver, several parties have handled them, and each relies on the marks for something different:

• Carriers and freight handlers use them to sort, load and stack cargo.
• Customs brokers and authorities use them to connect the physical cargo to the shipping documents.
• Your receiving warehouse uses them to match each pallet to a purchase order and decide how to handle it.

Why Shipping Marks Matter for Importers

Clear marks protect you when you have the least control over your cargo. After it leaves the factory, your goods pass through a port, a consolidation warehouse, customs and finally your dock, and a weak mark causes trouble at each stop.

LCL (less than container load) shipments carry the most risk. Imagine three pallets of electric motors and gearboxes sharing a container with other buyers’ orders. When the container is unpacked at the destination terminal, the marks are how handlers tell whose cargo is whose. Unclear marks lead to mixed-up pallets, lost time and storage fees.

Paperwork is the second pressure point. Brokers and authorities work from the shipping documents, and cargo can be examined. When the information on the packages doesn’t match the paperwork, it raises questions and slows release, which makes it one of the avoidable causes of shipping delays.

Your receiving team is the third. A crate of valves with no PO number on it has to be opened and checked by hand.

Marks are cheapest to fix before production, not after shipment. Put your required shipping mark in the purchase order so your supplier prints it from the start.

Types of Shipping Marks

Not everything on a crate is a shipping mark in the same sense. There are two groups: commercial identification marks, which you and your supplier define, and regulatory markings, which authorities require depending on the cargo and destination.

Regulatory markings sit outside your mark text. Whether each one applies depends on your product, packaging, transport mode and destination.

Commercial marks are yours to define. Write them into the purchase order and your supplier prints them from the start. Handling symbols are also agreed practice, although some cargo may need specific ones.

• Country of origin: US rules require the marking to be legible, indelible and permanent, with some exceptions (see 19 CFR Part 134). Canada’s marking program rests on section 19 of the Customs Tariff and the Marking of Imported Goods Order, and CBSA Memorandum D11-3-1 explains it. For goods from outside CUSMA countries, the marking is generally in English or French. Have your broker check whether your product needs it.
• Dangerous goods: Lithium batteries are regulated as Class 9 dangerous goods. Most shipments need either the lithium battery mark (smaller batteries that qualify for the exceptions) or the Class 9 lithium battery label with the UN number and proper shipping name (fully regulated batteries). Only narrow exceptions apply, such as button cells installed in equipment. Coatings, resins and adhesives often fall under hazard classes too, a common issue in industrial materials sourcing from China. Declare them to your forwarder early, because carriers need the details before booking.
• ISPM 15: covered in the pallets and crates section below.

Carton Shipping Marks: Main Mark and Side Mark

Carton marks are the most common shipping marks and the easiest to get wrong, because factories fill any blank you leave with their own default format. We recommend two sets per carton: a main mark on the long side and a side mark on the short side, so each face stays easy to read.

Here is a sample for a 120-carton shipment of control boards, the kind of repeat cartons buyers of electronic equipment sourcing receive.

Practical marking tips

• Print, don’t handwrite. Direct printing or waterproof labels survive transit better than marker pen. Black on plain carton is the safest choice.
• Show both unit systems if your warehouse or forwarder works in pounds and inches. G.W. and N.W. mean gross and net weight, and our guide to net vs gross weight explains how to work out each.
• Keep regulatory markings off this template. Origin, hazard and ISPM 15 marks are separate requirements, as covered above and below.

Pallets, Crates and ISO 780 Handling Symbols

Pallets and crates need the same core identification as cartons, with a different focus. A pallet holds many cartons, so its marks show what is stacked on it and how heavy it is. A crate usually holds one large, expensive item, so its marks focus on lifting and protection.

Marking pallets

We recommend marking the buyer, PO number, carton count and total gross weight on at least two sides, with labels visible through the stretch wrap. A pallet of solar inverters might read “PO-48213, 12 CTNS, G.W. 640 kg / 1,411 lb”. Buyers in new energy equipment sourcing from China ship batteries and inverters this way, where weight and handling marks decide how the pallet is moved and stacked.

Marking crates

Add lifting and balance instructions. A crate holding a tractor gearbox or hydraulic pump might carry “G.W. 185 kg / 408 lb, 120 x 80 x 90 cm / 47 x 31.5 x 35.4 in” plus the handling symbols below. Buyers of agricultural machinery sourcing see this often, since heavy parts are easily damaged by one wrong lift.

ISO 780 handling symbols

ISO 780 is the international standard for pictorial handling marks. Use its standard symbols instead of custom icons, so handlers in any country recognize them:

ISO 780 calls for “Sling here” on at least two opposite faces. It does not cover dangerous goods, which have their own labels.

ISPM 15 wood packaging marks

Solid wood pallets, skids and crates are typically subject to ISPM 15 treatment and marking in international shipping, but what applies depends on the type of wood packaging and the destination market. Plywood and other manufactured wood are generally treated differently. For the US, USDA APHIS states that importers must ensure wood packaging is pest-free, debarked, heat-treated or fumigated, and marked with an ISPM 15 logo, and it advises building ISPM 15 compliance into the supplier contract. Ask your forwarder what applies to your packaging and port.

Shipping Mark vs Shipping Label

The two are often confused, but they do different jobs. A shipping mark is identification information tied to your order. A shipping label is a routing sticker that helps a carrier direct and track the package.

Key differences

One shipment often carries both. On a crate of industrial valves, your supplier prints the mark before packing, and later a forwarder or destination warehouse sticks a barcode label beside it. The mark tells people what the cargo is, and the label tells a system where it goes. Carriers can create labels, but they can’t create your PO reference, so leave space on the box so later labels don’t cover your consignee line or carton number.

Shipping Marks on Your Shipping Documents

Your marks don’t stay on the box. The identifying information on the cargo should stay consistent with the relevant shipping documents to avoid discrepancies.

This depends on your forwarder and broker, but typically:

• Packing list: each carton, pallet or crate with its marks, weight and size.
• Bill of lading: the marks appear in the “Marks and Numbers” field.
• Commercial invoice: may reference the marks, depending on your shipping arrangements.

If your cartons read “Northline / Houston / PO-48213 / CTN 1-120”, the documents that reference marks should show the same details. A dropped PO number or a changed carton range is the kind of small difference that raises questions later. A Procurement Partner who handles supplier paperwork can run this cross-check across several suppliers at once. The checklist in the last section shows how to verify marks before dispatch, and the FAQ explains “N/M” on a bill of lading.

Common Shipping Marking Mistakes

Most marking problems are small errors that nobody caught before the cargo left the factory. These six come up most often.

How to Brief Your Supplier and Check Marks Before Shipping

A good marking brief is short, specific and sent early. Send it with the purchase order, because changing printed cartons or crates after production costs time and money.

What to Send Your Supplier

What to check before the cargo leaves

If you manage several suppliers at once, this routine stays consistent when one party handles the briefing and the checks. A China sourcing agent can send the same marking instructions to every factory, verify the results before dispatch and help keep the documents aligned.