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Verified gross mass
Under the international convention for safety of life at sea, a packed container may not be loaded onto a ship until its verified gross mass has been provided to the carrier and the terminal. It applies to every container on every route, and a missing figure means the box does not sail.
The essentials.
- Who requires it
- The International Maritime Organization, through the SOLAS convention, so it is a requirement of the shipping itself rather than of any importing country.1
- Whose obligation it is
- The shipper named on the bill of lading. In practice a forwarder arranges it, and the responsibility stays with the shipper.1
- Two ways to obtain it
- Weigh the packed container, or weigh the cargo and packing and add the container tare. Both are permitted and the method has to be documented.1
- It has a deadline
- The figure has to reach the carrier and the terminal before the cut-off for the sailing, which is earlier than most first-time shippers expect.
Who asks for it.
This travels with the goods wherever they go. Either Indonesia requires it on the way out, or it is an ordinary trade document that any buyer, bank and carrier expects to see.
What it does not cover.
It is not the packing list weight
The packing list states cargo weight. Verified gross mass is cargo plus all packing plus the empty container. Sending one where the other was asked for is the usual cause of a missed cut-off.
It proves nothing about the cargo
The declaration is about safe stowage on a ship. It says nothing about quantity, quality or whether what is inside matches the invoice.
Questions buyers ask.
Who actually does this in Indonesia?
The forwarder or the terminal usually arranges weighing, and the declaration is submitted in the shipper's name. Confirm before loading who is doing it and by when, because it is a small administrative step that stops a container completely.
Does it apply to less than container load cargo?
The obligation attaches to the packed container, so for consolidated cargo it falls on whoever packs the box. Your own goods contribute their weight to somebody else's declaration.
What happens if it is wrong?
A significant discrepancy found at the terminal can mean the container is stopped and reweighed at cost, and repeated discrepancies attract more attention from the line. It is worth using a real weighbridge rather than an estimate.
Where this comes up.
Container loading and what actually fits
The cubic capacity figures in circulation disagree with each other. What really decides a load is weight, geometry and the carrier's own specification.
Export documents, by category
Four categories, four different sets of paperwork and almost no overlap. Built from the reference pages, so it cannot fall behind what is published.
One container, several producers
What can share a container and what cannot, why regulatory documents never merge into one set, and the five steps that make it work.
Sources
- 1SOLAS requirement on verified gross mass of containers. International Maritime Organization. Checked 5 August 2026.
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