Pallet Patterns and Container Cube: Getting More Into the Box
Pallet size, load pattern and stacking decide how much of a container is actually used. How to plan a load that fills the cube without breaking the weight limit.
Paying for space you do not use
A container is billed as a container, whether it is full or not. The gap between what it could hold and what it actually carries - the cube utilisation - is paid for on every shipment, and it is set before the goods ever reach the port, by the pallet size, the load pattern and the stacking arrangement.
Improving cube utilisation is therefore one of the few freight savings that costs nothing but planning. It does not require a cheaper carrier or a slower service; it requires the load to be designed rather than packed.
Pallet size is the first constraint
A container's internal width accommodates a fixed number of pallets of a given footprint, and it does so without slack only for particular sizes. The common 1200 x 800 mm pallet and the 1200 x 1000 mm pallet fit a container in different ways and leave different amounts of waste. The Euro pallet and the standard pallet are not interchangeable in a load plan, and mixing them wastes space.
The choice of pallet footprint is therefore a freight decision, not only a handling one. Where the seller controls the pallet, choosing the footprint that tiles the container most efficiently can recover a measurable share of the container's volume. Where the customer's racking dictates the footprint, the constraint is upstream of the load plan and has to be accepted or renegotiated.
Load patterns decide the fill
For a given pallet, the way the cartons are stacked on it and the way the pallets are placed in the container determine how much of the cube is used. A block pattern fills better than a pinwheel on a rectangular pallet, while a pinwheel can be the better fit on a square one. Cartons overhanging or underhanging the pallet change both the stability and the fit.
Stacking height matters as much as footprint. Palletising to the container's internal height, within the limits the packaging can bear, uses the vertical cube that is otherwise wasted. Where the goods cannot be stacked that high, the lost height is a permanent cost on that product unless the packaging is redesigned.
Weight stops the fill before the cube does
A container can run out of permitted weight long before it runs out of volume, and dense cargo reaches that limit early. The payload available is the container's maximum gross mass minus its tare, and the road axle limits on the inland legs are often tighter still.
The consequence for load planning is that cube utilisation and weight utilisation have to be designed together. A load optimised only for cube can be overweight and illegal on the road; a load optimised only for weight can be half empty. The two limits have to be calculated side by side before the load is built, not discovered at the weighbridge.
Where the plan is made
The load plan is a drawing before it is a shipment: a pallet pattern, a container layout, a stacking height and a total weight, produced before the goods are packed. Where a supplier packs on the day, the plan has to be sent to them as an instruction, not left to the shipper's discretion.
That is why the plan belongs with whoever controls the packing. Some sellers keep it in-house and issue a packing instruction; others hand it to a partner who packs to it. A fulfilment operation that handles both the packing and the outbound movement - such as Dropioneer, which runs warehousing and pick-and-pack for cross-border sellers - can be given the load plan as part of the job, so the cartons are packed to the pallet rather than to whatever fits on the bench.
A four-step plan that pays for itself
First, fix the pallet footprint and check it tiles the container. Second, choose the stacking pattern and height for the cartons on the pallet, within the packaging's limits. Third, lay the pallets out in the container and compute the total weight against both the container's payload and the road limits on the inland legs. Fourth, record the plan as a packing instruction and reuse it.
The plan can then be improved the way any repeating process is improved: compare the planned cube utilisation with the actual, find the gap, and adjust one variable at a time. The goods that gain the most are the ones shipped regularly, because the plan is written once and used many times.
References
The loading unit the plan is built around is described under pallet, and the container it is loaded into under intermodal container. Where a load does not fill a container and is consolidated with other cargo, the arrangement is described under less-than-container load, and the verified mass a loaded container must declare before it sails is a requirement administered for maritime traffic by the International Maritime Organization.
| Decision | Set by | Effect on cube | Where it goes wrong |
|---|---|---|---|
| Pallet footprint | Seller, or customer's racking | Decides how the pallets tile the floor | Mixing footprints wastes width |
| Carton stacking pattern | Packaging and product | Decides the pallet's footprint fit | Overhang blocks the neighbouring slot |
| Stacking height | Packaging strength | Uses or wastes the vertical cube | Palletising below the container's height |
| Pallet layout in container | Load plan | Combines floor use with access | Leaving a gap that will move in transit |
| Weight check | Container payload and road limits | Caps a dense load before cube is reached | Overweight on the inland leg |
Does a bigger container always carry more of my goods?
Not necessarily. A container carries what its cube and its weight limit allow, whichever binds first. For dense cargo the weight limit is reached before the volume is used, so a larger container can be no more useful than a well-planned smaller one. Compute both limits before choosing the box.
How much can better load planning actually save?
It depends entirely on how much slack the current load has. A load already planned to the container's patterns and height has little to gain; one packed to whatever fits on the pallet can have a large and unmeasured gap. The saving is found by comparing planned cube utilisation with actual.
Should the load plan be made before or at packing?
Before. A load plan produced after the cartons are packed is a description of what happened, not a decision. Issuing it as a packing instruction - pallet footprint, pattern, height and total weight - is what turns it into a saving rather than a report.