In today’s article, we explain what an open top container is, its dimensions, capacity, and when to use it to optimize international shipping.
What is an open-top container?
An open-top shipping container is a rectangular storage container with an open roof, covered by a strong tarpaulin instead of a steel ceiling. This design allows cargo to be loaded from the top using cranes or other lifting equipment. Compared with general dry containers, open tops are more flexible for oversized and heavy goods, such as heavy machinery, pipes, and construction materials.
When do shippers choose it?
Shippers rely on open top containers in situations such as:
- Transporting cargo height exceeds the standard container’s limit, or when loading through the doors is not possible.
- Loading goods like steel pipes, timber, or glass sheets that require top loading.
- Shipping oversized equipment where dismantling would waste transit time and money.
- Moving project cargo to construction sites worldwide.
In these cases, open-top shipping containers save both effort and costs by avoiding unnecessary dismantling.
Open top container dimensions and specifications
In-Gauge dimensions matter because oversized cargo must fit within the container’s internal length, width, and height. Below is a breakdown of the most common sizes:
| SPEC | 20ft | 40ft Open Top | 40ft High Cube (HC) |
|---|---|---|---|
| Internal Length | 5.9m/590cm/232in | 12.03m/1,203cm/474in | 12.03m/1,203cm/474 in |
| Internal Width | 2.35m/235cm/92.5in | 2.35m/235cm/92.5in | 2.35m/235cm/92.5in |
| Internal Height | 2.35m/235cm/92.5in | 2.35m/235cm/92.5in | 2.69m/269cm/106in |
| Door Opening (W x H) | 2.34 x 2.28m/234 x 228cm / 92 x 89.7in | 2.34 x 2.28m/234 x 228cm / 92x89.7in | 2.34 x 2.59m/234 x 259cm/ 92 x 102in |
| Volume Capacity | ~32 m3 | ~66 m3 | ~76 m3 |
| Payload Capacity | up to 28,000 kg | up to 28,800 kg | around 28,500 kg |
| Max Gross Weight | 30,480 kg | 32,500 kg | 32,500 kg |
In short, if your cargo is tall but not too long, the 20ft option is the best choice. If you need space for longer or heavier equipment, go with the 40ft model. For project cargo that exceeds standard height, the high cube version provides the safest and most efficient solution.
Additionally, pay attention to the container weight. Ports, shipping lines, and destination customs strictly enforce maximum weight limits. Exceeding these limits can result in penalties, unloading delays, or the need to rebook the cargo as breakbulk.
Special variants: 30-yard open-top container
In some regions, you will find a 30-yard open-top container, commonly used for waste, bulk materials, or local transport. While not part of the standard ISO fleet, freight forwarders can arrange one depending on port availability.
Flat rack container vs open top container
Many shippers wonder: Should I use a flat rack or an open top container? Refer to the table below to help make your decision.
| Feature | Flat Rack CON | Open Top CON |
|---|---|---|
| Structure | No roof, only end walls;sometimes collapsible | Rectangular with solid side walls and removable tarpaulin roof |
| Best For | Extremely wide, heavy-duty, or irregularly shaped cargo | Tall goods that fit within width limits but exceed standard height |
| Protection | Limited protection from weather | Better protection from weather and theft |
| Loading/Unloading | Top or side loading with cranes | Top loading with cranes;doors can be used for side access if needed |
| Examples | Wind turbine blades, oversized machinery | Steel beams, tall equipment, heavy machinery |
Key considerations: Cost, safety, compliance, & availability
1. Cost
Many importers and exporters worry about the higher price of open-top containers compared to standard dry vans. While the upfront cost is higher, using an open top can reduce hidden expenses such as dismantling cargo, special lifting fees, or handling oversized goods inefficiently.
2. Safety of goods
The removable tarpaulin roof protects cargo from rain, dust, and other elements. With proper lashing, goods remain stable even on long sea voyages, minimizing the risk of damage.
3. Compliance with destination rules
Different countries enforce strict weight distribution, dimension limits, and out-of-gauge cargo regulations. Working with an experienced freight forwarder ensures compliance and prevents costly customs delays.
4. Container availability and shipping routes
Not all vessels carry open-top containers, and availability varies according to the trade lanes. Common routes from China to Europe, North America, and the Middle East typically offer space, but supply is limited. Some ports may also charge additional handling fees, so pre-booking is essential.
Ensure your oversized cargo reaches its destination safely and efficiently. Contact our freight forwarding team today for guidance on open-top container availability, booking, and compliance with international shipping regulations. Our experts will help you choose the right container and offer a customized solution.
Final thoughts: How to book an open-top container?
If your shipment requires special handling, an open-top container provides flexibility, safety, and efficiency. At Aisupply, we specialize in handling complex shipments from China to worldwide destinations. Whether you need a special container or expert guidance on oversized cargo, our team will provide the best solution to meet your needs.
