Flat Rack vs Open Top Containers: Which is Right for Your Machine?

Standard Container Limitations

Standard 20ft and 40ft containers have internal dimensions that limit the maximum size of cargo they can accommodate. When machinery exceeds these limits, special container types must be used.

Open Top Containers: When to Use

Open top containers are standard steel containers with the roof removed or with a removable tarpaulin cover. The walls and floor remain intact. They are used when cargo is too tall to fit through the standard container doors.

• Height exceeds standard container (2.39m) but width fits within 2.35m
• Machinery loaded by crane from above
• Tarpaulin cover provides weather protection in transit
• Walls still present — cargo can be side-supported
• More widely available than flat racks

Flat Rack Containers: When to Use

Flat rack containers are platforms with no walls or roof — just a steel floor with end walls (collapsible or fixed). They are used for cargo that exceeds standard width, or cargo that requires crane or side-loading from the port.

• Width exceeds 2.35m — machinery that overhangs standard container width
• Very heavy cargo requiring specialised crane at port
• Cargo that cannot be tilted or stood upright for top loading
• Allows overhang on both sides — with proper securing and port approval
• Available in 20ft and 40ft sizes

Flat Rack vs Open Top: Head to Head

When Neither Container Works: Break Bulk

If machinery is too large or heavy for any container type, it must be shipped as break bulk — loaded directly onto the vessel deck or into the vessel hold as a single piece. Break bulk shipping is complex and requires significant advance planning.

• Individual piece weight exceeds flat rack capacity (typically 40–45 tonnes)
• Dimensions exceed any container option
• Vessel booking from specialised break bulk ports
• Requires riggers, heavy lift cranes, and marine surveyor
• Limited sailing frequency — plan 6–10 weeks in advance

Frequently Asked Questions