Overweight and Oversized Cargo: Flat Racks, Open Tops and Permits

"Oversized" is not one problem. It is four, and each fails against a different limit. A unit can be over-length and fine, over-width by a hand's breadth and occupying two slots on a vessel, over-height and unable to pass under a cable on the last kilometre, or overweight while legal at sea and illegal on the road.

Search the term and you will find dimension tables for the flat rack container, carrier after carrier, with slightly different payloads for the same equipment. They are useful; none of them decides your shipment. What does is which limit you crossed, who owns it, and what must be true before the unit leaves the yard.

This article prints no freight rate, no equipment payload, no tax or duty figure and no percentage. Where a number would normally appear, it says which document carries it instead. No example here is a client case or a quotation; any scenario is illustrative. Nothing here is customs advice, and nothing makes us the importer of record: on the Indonesian side we assist and coordinate with the licensed importer and its appointed broker.

Four limits, four owners

Three words matter, because the booking desk will use them back at you. Cargo needing special equipment but staying inside its envelope is in gauge; cargo exceeding a flat rack or open top in length, width or height, yet still unitised, is out of gauge (OOG); cargo too large or heavy for any container is break bulk. The framing the carriers publish is a reasonable place to start: Maersk's out-of-gauge page.

The four limits behind it are unrelated.

• Length. Overhang past the deck changes lifting geometry and stowage; on a collapsible flat rack it may also mean travelling with walls folded.
• Width. The expensive one: over-width can consume the neighbouring slot, because cell guides assume a standard footprint. An open top cannot solve width.
• Height. Needs top loading or an open deck, then meets a second limit on the road: bridges, cables, gantries.
• Weight. Three ceilings stack — payload, the floor's tolerance for a concentrated load, the axle load the road allows. Passing one says nothing about the other two.

Each limit belongs to somebody else: the carrier owns stowage, the terminal owns what it will lift, the road authority what may travel, Indonesian customs whether the goods may enter. A shipment is only as ready as the least-ready of those.

Flat rack container, open top, platform, or a standard box

Read the equipment decision as a ladder, not a menu: each step gives freedom in one dimension and costs protection, certainty and speed. For the standard fleet, see our guide to container types and what each one is for.

The number in the brochure is not the number that binds you

Ratings vary by maker, age and owner: the carrier's table describes a representative unit, yours is specific. The binding figures sit on the unit's CSC plate and in the booking confirmation, which can also move you: a unit that fits underdeck may be stowed on deck, where the ship — not the cell guides — sets the envelope. Then the floor: a rating assumes weight is spread, while a concentrated load can exceed what the deck takes long before the total does. Ask for the actual unit; fix the centre of gravity before crating.

Weight is two questions: the box and the road

Every overweight discussion collapses two compliance questions into one. The second is where Indonesian shipments stall.

At sea, the question is verified gross mass. Under the SOLAS amendments in force since 2016, a packed container cannot be loaded without a VGM — weighed as a unit, or summed from components plus tare — and the shipper produces it. The IMO's summary settles one point: the VGM is a condition of loading, not an entitlement, and the master keeps discretion.

On the road, the question is axle load. Indonesia sets vehicle dimensions and permitted weights by road class under Law 22 of 2009, enforced at weighing stations. The transport ministry has run a Zero ODOL programme — over dimension, over load — for years, and the current posture is what to read. For a heavy indivisible load the question is not "how heavy" but "how is that weight spread across axles, on which trailer, over which route".

The two disagree: a container inside its VGM can be illegal on an Indonesian road, and a piece legal on the road can be refused at the gate. Choose trailer and route with the container, not after the vessel sails.

Securing is a design, not a habit

Out-of-gauge cargo is held by lashing and dunnage, measured against the IMO/ILO/UNECE Code of Practice for Packing of Cargo Transport Units — the CTU Code. Its division of responsibility is the part to internalise: the shipper secures the cargo in or on the unit, the carrier secures the unit to the ship. A badly secured flat rack is not the carrier's problem at the quay.

A securing plan answers five questions: where the load sits, centred, with the centre of gravity declared; what holds it down, at angles resisting fore-aft and lateral movement, each point's working load established; what stops lateral movement — dunnage, chocks, friction; what protects the lashing at each contact point; and who signs it off.

That last one changes outcomes. A marine surveyor attends project cargo and photographs the arrangement before it leaves the yard, and some carriers require approval before a flat rack travels with end walls down. Without that record, a shifted load becomes an argument about fault.

How out-of-gauge freight is built, not quoted

There is no rate card for this cargo, but the mechanism is how you sanity-check a quotation.

Out-of-gauge freight is rarely priced per box. It is built from components: equipment and availability on your lane; the space the unit occupies, which for over-width cargo may be more than one slot; the measurement basis — per unit, per cubic metre, per running metre; lashing material and labour; heavy lift at both ports; and the road leg, with trailer, route survey and any escort.

Two habits separate a quote from a revision. Declare dimensions as packed — crating and lashing protrusions included; the bounding box, not the machine. And record weight per piece: a total says nothing about whether any item can be lifted. Our guide to what CBM means covers the volumetric side; chargeable weight versus actual weight explains why the heavier or larger governs elsewhere.

Then ask of every quotation: what is the basis, and what would change it?

The document set has to describe one object

Most out-of-gauge problems at a port are documents describing three different objects, not cargo problems.

A mismatch is not a fine at first. It is a terminal refusing to load, or a unit shut out because booked dimensions do not match what arrived at the gate — a safety decision taken by people who will not argue at the quay. Found at destination, the cargo joins the queue in our page on why cargo gets held at Indonesian customs.

Indonesia: the permit question is asked twice

On this route "permit" covers two unrelated conversations, and a shipment can pass one and stall on the other.

The permit about the goods is import control. Whether a tariff line is restricted is looked up line by line in Indonesia's National Trade Repository; where it is restricted, an Import Approval is issued to an Indonesian importing entity — not to the exporter, not to the forwarder. That layer has its own guides for machinery and steel. Here only sequencing matters: answer this before booking equipment, because a line that cannot be approved makes the flat rack irrelevant.

The permit about the truck is road transport. An over-dimension or over-weight load raises route selection, axle distribution, bridge and height clearances, travel windows and sometimes escorts — arranged with licensed local transport and the road authorities, and route-specific in a way no rate table settles. What can be settled early is the survey: the route from port to site, including the last kilometre into a plant, where gates, turning circles and ground bearing often constrain.

A port checkpoint, not a permit. Confirm the discharge port can handle the unit — crane capacity, yard space, receiving hours. Oversized cargo is often delivered direct rather than stored, so the truck must be there when the vessel is.

What to send at quotation time

A quotation is only as good as its input; this set makes a first answer possible:

• Dimensions per piece, as packed — crating, pallets, lashing protrusions, dunnage — plus lifting points and handling method.
• Weight per piece, the total, and the centre of gravity if marked.
• Photographs of the cargo and the packed unit. One image prevents three rounds of questions.
• Whether it can be dismantled — often the cheapest engineering decision in a project, and take it before crating.
• Origin and destination, plus site access: gate width, ground surface, whether a low loader can turn.
• The date window, and which end is fixed: vessel or site.
• The importing entity and its readiness, so the goods-side question runs in parallel.

What we coordinate, and what we do not decide

We assemble the file and organise the movement: checking cargo information, packed dimensions and weights, classification basis and transport documents against each other while the goods are at origin; booking special equipment and confirming what that unit is rated for; coordinating lashing and surveyor attendance; and coordinating with the licensed importer, its broker, and local transport.

We do not own the vessels, containers, terminals or trailers, and we do not issue permits, approvals or certificates — those are determined by carriers, terminals, road authorities and Indonesian regulators. We get the questions to the right party, in order, and make sure the file they judge agrees with itself.

This article sits in our cargo requirements hub, with the guides for goods that most often arrive out of gauge.

If a unit is coming that will not fit a box, send the packed dimensions, weight per piece and photographs through our contact page. We respond within two hours on working days, and a preliminary quotation normally follows within 48 hours of complete documents. Out-of-gauge movements are confirmed after review, because equipment and route must be checked before a number means anything.