Choosing between a 20-foot, 40-foot and 40-foot high-cube container depends on cargo volume, payload, carton geometry and the economics of the specific trade lane.
Example capacities
Hapag-Lloyd’s current equipment pages show example capacities of about 33.2 CBM for a 20ft standard, 67.7 CBM for a 40ft standard and 76.3 CBM for a 40ft standard high cube. The carrier also states that specifications are examples and can vary by manufacturer.
See the official 20ft standard, 40ft standard and 40ft high-cube pages for current example specifications.
20ft standard
A 20ft container can suit dense cargo or smaller full-container shipments. Because payload can become the limiting factor before cube for dense products, do not choose by volume alone.
40ft standard
A 40ft standard roughly doubles usable internal length compared with a 20ft and can fit significantly more cubic volume. It is often considered when cargo cube, not payload, is the main constraint.
40ft high cube
The high-cube version adds internal height and therefore more cubic capacity. It can be useful for bulky, lower-density cargo where vertical space matters.
Model your shipment
Use the Container Loading Calculator to compare cargo CBM and weight with example capacities. For identical cartons, use the Cartons Per Container Calculator.
Container selection should be confirmed against the actual equipment offered by the carrier or forwarder, including door opening, payload and operational loading constraints.
Capacity comparison at a glance
| Container | Example internal cube | Planning strength | Common constraint |
|---|---|---|---|
| 20ft standard | About 33.2 CBM | Smaller FCL lots and dense cargo | Payload can matter before cube |
| 40ft standard | About 67.7 CBM | Higher-volume general cargo | Carton geometry/utilization |
| 40ft high cube | About 76.3 CBM | Bulky lower-density cargo | Height/door and payload constraints |
These are example equipment figures, not booking guarantees. The actual container supplied can vary, which is why the final load plan should use the carrier or forwarder’s equipment details.
Cube is not the same as usable loading capacity
A container with 33.2 CBM of internal volume will not necessarily accept 33.2 CBM of cartons. Carton dimensions create leftover spaces, door openings can reduce usable geometry, and dunnage or load securing consumes room. Theoretical volume is a ceiling, not a practical target.
Worked utilization example
If a shipment occupies 24 CBM, its simple volume utilization is about 72% of a 33.2 CBM 20ft example, about 35% of a 67.7 CBM 40ft example and about 31% of a 76.3 CBM high-cube example. That does not automatically mean the 20ft is best: gross weight, carton fit, rates and operational loading still decide the result.
Use the Container Loading Calculator to compare both volume and payload utilization.
Frequently asked questions
Does a 40ft container hold exactly twice a 20ft container?
Not exactly. Internal dimensions, equipment specifications and loading geometry differ. Compare actual equipment rather than applying a simple 2× rule.
When should I choose high cube?
High cube is most useful when additional internal height helps bulky, lower-density cargo and the route/equipment economics justify it.
Can a container be full by weight before volume?
Yes. Dense cargo can reach payload limits with significant empty cube remaining.
Should I plan to 100% volume utilization?
No. Real loading needs tolerance for carton geometry, door clearance, dunnage, securing and handling access.
Related guides
PackToolbox guides are built around stated formulas, practical examples and source checks for changeable carrier, freight and logistics rules. Calculators are planning aids; final requirements should be verified with the relevant carrier or service provider.