When consolidating beats filling a container

Ask any freight desk and the arithmetic is unambiguous. A full container load is cheaper per cubic metre than groupage, often substantially, and the advantage widens the closer you get to filling the box. A 40ft high cube holds about 76 cubic metres, of which roughly 68 is realistically usable. A 20ft holds about 33. Divide the all-in rate by the volume you actually ship and the incentive is obvious.

So buyers round up. An order that would have taken 45 cubic metres becomes an order that takes 68, because the freight line reads better and the difference feels like a saving. The freight line does read better. The question nobody asks in that moment is what happened to everything else on the balance sheet.

What rounding up actually buys

The extra volume is not empty space that came free. It is stock — bought earlier than planned, at a price agreed before demand was known, financed by the business until it sells.

Put figures against it. A 40ft high cube at 2,600 dollars for 68 usable cubic metres works out at about 38 dollars per cubic metre. Groupage for the 45 cubic metres you actually wanted, at say 55 dollars per cubic metre, comes to 2,475. The container looks dramatically cheaper per cubic metre and costs 125 dollars more in absolute terms — and hands you 23 cubic metres of stock you had not planned to buy.

That stock then costs money every month it sits. Capital tied up, warehouse space, handling, insurance, shrinkage, and the risk that the goods are worth less later than they are today. The usual planning range is twenty to thirty percent of inventory value a year. The freight saving is immediate, visible and small. The carrying cost is slow, invisible and larger.

The second clock: seasons and shelf life

In some categories the carrying cost is the lesser problem. Apparel bought against a selling window has a date after which it is no longer the same product commercially, whatever its condition. Cosmetics carry a shelf life and, once opened, a period-after-opening; a distributor will not take stock with a third of its life gone. Building materials are more forgiving, but specifications change, ranges are superseded, and a pallet of last year's profile is a discount waiting to happen.

Stock that misses its window is not sold at a discount to the plan. It is sold at whatever clears it, and the difference between those two numbers is usually a multiple of the freight that was saved.

Consolidation changes the shape of the problem

The alternative is not to accept groupage rates forever. It is to fill the container with more than one thing. Four categories at seventeen cubic metres each fill the same box as one category at sixty-eight, at the same rate per cubic metre, with none of the four bought ahead of its own demand.

This is harder than it sounds when the volumes sit with separate suppliers who have no common booking, no shared cut-off and no reason to coordinate with one another. It becomes straightforward when a single party is buying across the categories and can plan the movement as one shipment rather than as a negotiation between parties who will never speak.

That is a large part of why buyers work through a trading company rather than contracting every factory directly. The value is not the price on any individual line. It is that the container is filled with things somebody wanted.

How a consolidated booking actually works

The mechanics are less mysterious than the word suggests. Several suppliers deliver into one place — a container freight station near the port of loading, or one supplier's warehouse acting as the collection point. The goods are stuffed as a single container, move on one bill of lading, and are unpacked at destination against separate commercial invoices for each supplier.

Two things make or break it, and both are dates. The first is the cargo-ready date for every supplier in the load, which has to sit inside a window rather than on a single day, because one supplier running three days late holds the entire container. The second is the port cut-off, which does not move for anybody.

• Set a consolidation window rather than a date — five to seven working days is usual — and require every supplier to deliver inside it.
• Nominate the collection point and state who pays for the inland leg to it, in the purchase order rather than in an email afterwards.
• Agree in advance what happens to a supplier who misses the window: the container ships without them, on the next sailing, at their cost.
• Keep invoices and packing lists separate per supplier, so the declaration is built line by line and a classification query touches one supplier's goods rather than the whole box.

None of that is difficult. It is administration, done once, in exchange for full container economics on volumes that do not individually justify a container.

When filling a container is the right answer

Rounding up is not always wrong, and treating it as a rule would be as lazy as the habit it replaces. Filling the box is the correct decision when the following hold.

• Demand is known rather than forecast — the goods are already sold, or committed against a contract with a date on it.
• The line does not date: a commodity, a standing consumable, a building material with a stable specification.
• The origin offers a genuine price break at the higher quantity, and the break is larger than the carrying cost of the extra units for as long as you will hold them.
• Freight is large relative to goods value, which is the case for bulky, low-value products where the cube dominates the landed cost.
• Warehouse space is already paid for and standing empty.

The question to ask before rounding up

Both answers are legitimate. What is not legitimate is letting a rate card decide a purchasing quantity. Freight is a cost of moving goods you decided to buy — it should not become the reason you bought them.