Carton data to collect before you book freight

A freight quote is an estimate built on numbers somebody else has to supply. When those numbers arrive late, or change, or turn out to have been rounded, the quote does not bend - it is replaced. Collecting the carton data early is the cheapest piece of logistics work available to a buyer.

The eleven figures

These are the fields a forwarder needs to give you a rate that holds. Ask for them per SKU, not per shipment, because a mixed container is priced from each line.

Field	Note
Units per carton	And the inner packing unit, if retail packs are packed in an inner
Carton dimensions	Length by width by height, outside, in centimetres, packed
Net weight per carton	Product only
Gross weight per carton	Including carton, inner packing and any pallet share
Carton grade	Board specification, and whether it is a standard export carton
Pallet pattern	Cartons per layer, layers per pallet, pallet type and height
Total cartons	From the factory's packing list, not from the order quantity divided by units per carton
Total volume	Cubic metres, and the divisor used if a volumetric weight is quoted
Total gross weight	The figure the carrier will check against
Label and marking spec	Shipping marks, carton labels, any retail-facing marking
Incoterm and named place	The term plus the place it names, because the place changes the price

Two of these cause most of the trouble. Total cartons is usually an estimate until packing finishes, and it is the figure the carrier will hold you to. Gross weight is usually quoted net plus a guess, and cartons are heavier than people expect once inner packing and pallets are counted.

Volumetric weight, in one paragraph

Carriers charge on the greater of actual weight and volumetric weight. Volumetric weight is the carton's volume divided by a conversion factor, and the factor differs by mode and by carrier, which is why the same shipment can be priced two ways. The practical consequence is that a light, bulky carton is billed on its size. A carton that is a few centimetres oversized across a full container is not a rounding error; it can be the difference between fitting the load and paying for a second one.

Ask which divisor was used whenever a volumetric weight appears in a quote. Two quotes that used different divisors cannot be compared, in the same way that two prices on different Incoterms cannot.

Carton strength is a decision, not a default

Board grade is chosen against a journey. A carton that goes from a factory to a nearby warehouse has an easier life than one that is palletised, stacked four high, railed across a continent and handled by a distribution centre. Transit testing standards exist to make that comparison concrete rather than optimistic: a packaged product is subjected to a defined sequence of drops, vibration and compression that stands in for the journey it will take.

You do not have to run transit testing on every order. You do have to decide which of these two describes your route, because the answer sets the board grade and the void fill, and both of those change the weight and volume you report to the carrier:

• Direct to retail. Cartons are handled by a distribution centre, may be stacked, and are often opened in front of staff who will report damage. Board grade and print quality both matter.
• Repacked on arrival. Goods are taken out of the export carton and re-packed for the channel. The export carton only has to survive the journey, not the shelf.

Hooks and rod tips deserve a specific mention here, because they are the two components most likely to damage their neighbours. Hook protection is a packing decision, not a product decision, and it belongs in the specification alongside the carton data rather than being left to the packer.

What changes after booking, and what it costs

Three changes account for most re-quotes. Dimensions change because the packer found a better fit. Carton count changes because the yield was different from the estimate. Gross weight changes because the inner packing was upgraded. Each is small, each invalidates a rate, and if the shipment has already been consolidated the carrier may re-measure and re-price at the port.

The defence is to make the carton fields controlled. Put dimensions, units per carton and board grade in the specification with a version number, the same way colour is controlled. Then a change is a change order, priced and dated, rather than a surprise discovered at the freight desk.

The sequence that avoids the problem

1. Agree the packing specification at the sample stage, alongside the product specification.
2. Ask for carton dimensions and weights with the order confirmation, not with the shipping documents.
3. Ask again at packing completion, and reconcile against the earlier figures.
4. Only then request rates, and state the divisor and the Incoterm place in the same message.
5. Keep the packing list as a controlled document, since it is the one the carrier and the customs broker both work from.

None of this is complicated, and the reason it goes wrong is simply that packing is treated as the last step rather than a specification item. It is also worth reading what documents travel with a shipment before the first booking, because the paperwork that has to match the cartons is easier to set up than to correct.