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VGM Before the Crane: Which Weight Actually Loads a Container
A container can be documented correctly and still not be loaded, because one number on the shipping order has to be verified rather than estimated. That number is not the cargo value, the commodity weight on an invoice, or the figure a supplier put on a packing list from memory. It is the gross mass of the packed box, established by a method the rules allow and communicated before the terminal builds its loading plan.
Key facts
- A condition, not a formality. Under the SOLAS requirement implemented since 2016, a packed container may only be loaded onto a ship to which the regulations apply once its verified gross mass has been determined and provided.
- Two permitted methods. Either weigh the packed container, or weigh every cargo item and package inside it and add the container's tare mass. Guidance on the two methods is published by the International Maritime Organization.
- The responsible party is the shipper. The obligation sits with the party the bill of lading names as shipper, which is why a booking cannot outrun a missing measurement.
- A warehouse scale is not the same document. Pallet weights captured at goods-in are our operational record; the verified figure is a declaration for the container as packed, and the two are not interchangeable.
Why a verified number and a declared number differ
Packing lists are written before the packing happens, which is their virtue and their problem. A supplier who knows their product will state a mass that is usually close and occasionally wrong by the margin of a pallet, a dunnage board or a stretch of shrink film. For most commercial purposes close is enough. For a stowage plan it is not, because the plan is built on the mass of boxes, not of goods, and a container that arrives with a number nobody verified simply waits.
The distinction has an operational consequence for anyone consolidating. Groupage puts several parties' cartons in one box, so the verified figure depends on measurements taken after everyone else's freight is inside. Whoever assembles the container is the only party holding the number that goes onto the document, and that is a fact about workflow rather than about authority.
What our floor measures, and what it does not decide
Every inbound pallet and carton is weighed and dimensioned at goods-in, and outbound parcels are weighed on our equipment rather than taken from an invoice. Those records are what make a container's contents reconstructable when a discrepancy appears at the terminal. What we do not do is sign the verified declaration for cargo we did not pack, or adjust a number to match a document.
Where the packing list and the scale disagree, we photograph before opening and raise an exception, which reaches a responsible person within two hours and closes within twenty-four of opening. That is the mechanism, not a remedy for a wrong figure on someone else's paperwork: it is evidence the discrepancy was caught before the seal went on.
| Number | Established by | Used for | Who owns it |
|---|---|---|---|
| Invoice mass | The supplier's records | Commercial documents | Supplier |
| Goods-in weight | Our dock scale, per carton or pallet | Storage, handling and rebuild planning | Our operational record |
| Container tare | The box's own plate marking | Adding to cargo mass under Method 2 | Equipment supplier |
| Verified gross mass | Weighing the packed box, or summing and adding tare | The terminal's loading plan | The named shipper |
Where the clocks sit
A container ship's stowage plan closes long before the vessel is alongside, so the verified figure is due at a cut-off set by the line and the terminal, not by your supplier's production calendar. Miss it and the box stays on the quay until the next departure takes it. On a consolidated shipment the window is tighter than sellers expect, because the number cannot exist until the last party's freight is inside.
What a missed cut-off costs
On our door-to-door ocean estimates — 18-25 working days into a US west coast port, an approximation rather than a promise — a missed cut-off costs a sailing rather than a day, which is the difference between a late delivery and a late quarter.
How to find out who is actually responsible
Read the booking confirmation for one word: who is named as shipper. That party is the one the carrier will chase for the verified mass, and it is also the party the terminal's instructions arrive at. If you are shipping under your own bill, the duty is yours even if a warehouse did the packing. If your freight moves on a consolidated bill issued by a forwarder, the forwarder's name is on it and the practical dependency is their weighing process, which is worth asking about before a first shipment rather than during a delay.
Two questions settle it: does the provider weigh packed containers or build the figure from cargo plus tare, and which appears on the document they hand over. A provider who cannot name the method is using the invoice, and an invoice is not a measurement. Standing answers on the packing side are on our FAQ page, and the freight arrangements sit on the DDP sea and air page.
Do you weigh the container yourself or take the total from my packing list?
Both routes exist in our workflow, and which one applies depends on who packed the box. Where we build the container, the figure is produced from cargo actually weighed on our equipment with the box's tare added, and the records behind it are ours to show. Where a supplier ships a sealed container, we work from what the supplier hands us and say so, because a warehouse that has not seen the inside cannot honestly declare the whole. We will not substitute a supplier's list for a measurement we did not take.
The verified mass came out higher than my documents. What happens next?
Nothing is corrected silently. The difference is photographed at the dock, an exception is opened against the affected lines, and the movement holds until the paperwork and the measurement agree, because a number that changes between an invoice and a loading plan is exactly the discrepancy a terminal is designed to stop. Our desk then puts the measured figure in front of you and the party named as shipper, and the decision about which document gets amended belongs to them rather than to us.
My goods travel as a shared container. Who provides the figure?
The party that assembled the container, because nobody else can know what went into it. That is why consolidation puts the verified number in the consolidator's hands and creates a dependency on their cut-off rather than yours. Ask before the first booking which method is used, whether the per-party weights are released to you as a record, and by when your freight must physically be inside for the figure to be produced at all. Our service pages describe the consolidation workflow, and the answer to that third question is a date rather than a promise.
Checked 2 November 2026 (2026-11-02). FulfillDock by SBT — the sign carried by Shenzhen Shibotong International Logistics Co., Ltd. across its Dongguan, Shenzhen and Suzhou sites totalling 24,000 square metres — weighs inbound cartons and pallets at goods-in and outbound parcels before despatch. The verified-gross-mass requirement and the two permitted methods are taken from the International Maritime Organization's published material on SOLAS container weighing. Responsibility for the declaration follows the party named as shipper; we do not sign a figure for cargo we did not pack. No amounts appear in this note and transit figures are estimates, not commitments.
