How many shipments does your order actually need?

Shipment count as the only planning unit

An order is not one thing. It is a set of parcels that may be merged, split or held, and the only unit behaving predictably is the shipment: it carries a set of fixed lines, it crosses a border once, and it consumes one tracking number.

Weight scales smoothly, which is why planning on kilos alone hides the structure. Shipment count moves in whole numbers, and each step adds a complete set of lines.

So start with a count. One, two or three shipments, then decide what goes in each, then check weight and volume. Starting with weight usually ends with a count you did not choose.

1. Fixed lines repeat per shipment, not per kilo.
2. Each shipment is assessed at the border on its own.
3. Choose the count first, then distribute the goods.

Store count and parcel count compared

Four stores can produce four parcels, or one. The stores matter because each ships separately to the warehouse and each carries its own arrival timing. They stop mattering the moment the items sit on the same shelf.

What survives from the store structure is the packaging. Four cartons with retail boxes can occupy more volume than a single consolidated build, and volume is what a volumetric line bills.

A practical rule: treat stores as a timing question and parcels as a costing question. Once everything has arrived, only the second one is still open.

1. Stores decide the arrival spread, not the shipment count.
2. Retail packaging from four sellers is the volume that survives.
3. Once all items have arrived, plan on parcels only.

Weight brackets that reward a second parcel

Splitting is not only a cost. A parcel that crosses into the next half-kilo step pays for every hundred grams above the boundary, and moving one heavy item out can drop both parcels into a cheaper step.

This works when the item being moved is dense and small. It fails when the item is bulky and light, because the volume travels with it and the second carton adds volume of its own.

Run both arrangements through the same divisor and the same rounding step, then compare. Two shipments that each sit just under a boundary often beat one shipment sitting well over it.

1. Dense, small items are the ones worth moving out.
2. Bulky items carry their volume into the new parcel too.
3. Compare arrangements with one divisor and one rounding step.

Duty assessed once per shipment

Every shipment is assessed on its own consignment value, which is goods plus postage plus any other charges on that parcel. Two shipments therefore produce two assessments, each against the threshold for that destination.

Sometimes that helps. Two parcels can each sit below a line that a single large parcel would cross, and the thresholds published here run from a low postal de minimis on one route to four figures on others.

Sometimes it hurts. Below the line you may pay nothing; above it, duty and tax apply to the whole consignment value rather than to the part above the line.

1. Consignment value is assessed per shipment, not per order.
2. Splitting can keep each part under a threshold.
3. Once a consignment crosses the line, the whole value enters the base.

Rung placement: too early, too late

This desk re-files entries onto a different rung when readers keep opening them at the wrong moment, and shipment count is the clearest case. Planning the count after the goods have arrived is late. Planning it before the first link is pasted is early, because you do not yet know what the sellers will do.

The useful moment sits between arrival and consolidation: everything is on the shelf, nothing has been built, and every option is still open.

Write the count down at that moment and keep it. It is the number every later question gets measured against.

1. Best moment to fix the count: everything arrived, nothing built.
2. Too early you cannot know; too late the lines are already paid.
3. Record the count and the date, then hold to it.

Counting shipments before you confirm anything

Before confirming, list the shipments you intend to create and what goes in each. One line per shipment is enough: destination, contents, line, and the date it needs to land.

Then check that list against the goods. A restricted item belongs in its own shipment. A date-critical item belongs in the earliest one. Everything else can wait for the cheapest build that still fits the plan.

If the list has more shipments than it has items, the plan needs rework. That happens when a restricted item forces a split that leaving the item out entirely would have avoided.

1. One line per shipment: contents, line, landing date.
2. Restricted items travel alone.
3. More shipments than items means the plan needs rework.

Where the numbers in this entry come from

Desk-wide re-read, KB-2026-11: nine entries were re-filed onto a different rung after readers reported opening them too early or too late, which is where the rule about fixing the shipment count between arrival and consolidation comes from.

◇KB-2026-11· 2026-09-30 See the batch ledger · Challenge a figure

Entries filed next to this one

• What changes when you add another store to the order?

  One more store adds a shipment, and a shipment carries a handling fee and its own border assessment. The purchase is small; the shipment is not. Add the store only when the item is worth a whole consignment to itself.

• When is it worth consolidating parcels, and when is it not?

  Merge when each parcel would otherwise pay a minimum of its own, when they are heading to the same destination, and when waiting for the slowest one does not break a date. Do not merge when one item is bulky but light, when a piece needs a specialist line, or when the build cut-off would add about a week.

• How is chargeable weight calculated on a consolidated parcel?

  Multiply the packed carton dimensions, divide by the line’s divisor, and compare that figure with the scale reading. The larger one is chargeable, then rounded up to the line’s step. Consolidation is where the two diverge, because the outer carton keeps its volume while the contents get lighter.

Gauges this entry points at

• Landed-cost ladder

  Three ways to move the same parcel, priced side by side.