In short: The two most common ocean containers are the 20ft standard (about 33 cubic metres, max payload around 28,200 kg) and the 40ft standard (about 67 cubic metres, max payload around 26,700 kg). A 40ft High Cube (40HC) adds extra height for another 6 cubic metres of space and is now the default choice for most US importers shipping general cargo. Which size you need depends on your product's density: heavy, compact goods hit the weight limit before they run out of space, while light, bulky goods run out of space long before they hit the weight limit.

What are the standard shipping container sizes?

Ocean freight containers come in a small number of standard sizes, regulated by ISO standards so they fit any vessel, crane, or truck chassis worldwide. The four you'll encounter as a US importer are the 20ft standard, 40ft standard, 40ft High Cube, and (less commonly) the 45ft High Cube. Epic Sourcing's freight forwarding service helps importers choose the right size for each shipment.

What are the exact dimensions and weight limits for each container size?

Figures are industry-standard approximations; exact tare weight varies slightly by container manufacturer and age, so always check the container's data plate (CSC plate) for the specific unit you're loaded into.

What's the difference between tare weight, payload, and gross weight?

Tare weight is the weight of the empty container itself. Payload (also called net weight capacity) is the maximum weight of cargo you can legally load inside it. Gross weight is tare weight plus payload combined — the total weight of the loaded container, which is what matters for road weight limits and vessel stability declarations (VGM, or Verified Gross Mass, is mandatory for all export containers under SOLAS rules).

How many units actually fit in a 40ft container? A worked example

Take a common example: a carton of homewares measuring 50 cm x 40 cm x 35 cm (0.07 cbm per carton), weighing 12 kg per carton.

By volume, a 40ft standard container (67 cbm) could theoretically hold around 67 / 0.07 = ~957 cartons, accounting for realistic stacking loss (usually 10-15% unusable space around pallets and irregular gaps), a practical estimate is closer to 800-850 cartons.

By weight, 800 cartons at 12 kg each is 9,600 kg — well under the ~26,700 kg payload limit. In this example, the container runs out of space long before it hits its weight limit, which is typical for lighter homewares, textiles, and plastics. For dense goods like tiles, metal hardware, or machinery, the weight limit is usually the binding constraint instead, and you'll stop loading well before the container is visually full. This same principle of matching product density to logistics decisions applies whether you're planning a full container or planning fulfillment at the destination end.

When should a US importer choose FCL over LCL?

Full Container Load (FCL) means you book an entire container for your shipment alone. Less than Container Load (LCL) means your goods share a container with other importers' cargo, consolidated at origin and deconsolidated at destination.

FCL generally becomes cost-effective once your shipment fills roughly 12-15 cbm or more, since LCL is priced per cubic metre and the per-unit cost advantage of FCL kicks in around that volume. FCL also avoids the extra handling, consolidation delays, and higher damage risk that come with LCL, where your cartons are loaded and unloaded alongside other shippers' freight multiple times.

Do container dimensions differ between shipping lines?

Internal dimensions are standardized industry-wide because containers must be interchangeable across ocean carriers, ports, and trucking chassis globally. Minor variations of a few centimetres can occur between manufacturers and container age (older containers may have slightly more wall thickness), which is why the figures in the table above are presented as approximate industry averages rather than fixed exact numbers.

Frequently asked questions

What is the difference between a 40ft standard and a 40ft High Cube container?

They have identical length and width, but the High Cube is 30 cm (about 1 foot) taller, adding roughly 9 cubic metres of usable space — useful for bulky, lightweight cargo that runs out of vertical space before it hits the weight limit.

How much weight can a 20ft container hold?

A standard 20ft container has a maximum payload of approximately 28,200 kg, though real-world usable weight is often lower once you account for US road weight restrictions on the trucking leg after the container leaves port.

What is VGM and why does it matter for container shipping?

Verified Gross Mass (VGM) is a mandatory declaration of the total weight of a loaded container (cargo plus tare weight) that shippers must submit before the container can be loaded onto a vessel, required under international SOLAS safety regulations.

Is a 45ft container common for importing from China to the US?

Less common than 20ft or 40ft containers. It's mainly used for very high-volume, low-density cargo, and not all trucking equipment in the US is configured to handle 45ft containers on the final road leg, so availability can be more limited.

How do I know if my shipment should be FCL or LCL?

As a rough guide, if your cargo volume is below about 12-15 cubic metres, LCL is usually more cost-effective; above that threshold, FCL typically becomes cheaper per unit and faster, since it skips the consolidation and deconsolidation steps LCL requires. If you're just getting started building a product line before worrying about container loads, our comparison of print on demand vs dropshipping vs a sourcing agent covers what stage justifies bulk ordering at all.

How Epic Sourcing helps

Epic Sourcing's bilingual teams on the ground in China and Vietnam handle freight consolidation and container loading planning for US importers, helping you choose the right container size and shipping method for your product's actual density and volume. Get in touch with Epic Sourcing for no-pressure guidance on your next shipment.

Last updated: 5 August 2026