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Container loading 101: fitting more into every box
Two exporters shipping the same volume of the same product can end up needing a different number of containers, purely because one planned the load and the other guessed. Container loading is a genuinely solvable planning problem once you know the two things that actually limit it: volume and weight.
Two limits, and only one binds at a time
A container has a maximum internal volume and a maximum payload weight, and whichever one your cargo hits first is the one that actually limits how much fits. Dense, heavy cargo (like canned goods or bagged grain) usually hits the weight limit first with plenty of volume left over; light, bulky cargo (like empty-ish produce cartons or foam boxes) usually hits the volume limit first with plenty of payload capacity left over.
Knowing which limit you are up against changes the decision: if you are weight-bound, a bigger container will not help, you need to reduce weight or split the shipment; if you are volume-bound, a taller or longer container (a high cube, or a 45ft) genuinely adds usable space.
Standard, high cube, and reefer
A 40ft high cube is roughly 30 cm taller inside than a standard 40ft, which is a meaningful volume gain for the same footprint, useful for light, bulky cargo. Reefer (refrigerated) containers trade some of that internal volume for insulation and a T-bar airflow floor, so a 40ft reefer holds noticeably less than a 40ft dry container of the same nominal length, and cargo has to stay below a marked load line for air to circulate.
None of this is guesswork you need to redo from scratch each time: once you know your carton size and weight, the fit per container type is a fixed calculation.
Planning before you book, not after
Work out cartons per container for your actual carton dimensions and weight before you commit to a container count, not after the cartons are palletised at the dock. A five percent improvement in fit is a real container fewer on a large shipment.
Real stuffing loses a little to gaps, bracing and pallet overhang versus a pure geometric calculation, so treat any planning number as a strong estimate to confirm with your forwarder, not a guarantee down to the last carton.
Try the free container load calculator
See how many cartons fit a 20ft, 40ft, high cube or reefer container, and how many containers your shipment needs.
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