Open Top Container (OT)

What Is an Open Top Container?

An open top container is structurally identical to a standard dry container except it has no permanent roof. Instead, the top is covered by removable steel or aluminium roof bows and a heavy-duty waterproof tarpaulin (tarp). The tarp can be partially or fully removed to allow crane or overhead loading.

Open tops are designated OT in booking systems and carry the ISO type code U0. They are available in 20ft and 40ft lengths. The 20ft Open Top is more commonly used because it handles heavier cargo that also reaches the weight limit before filling the volume.

Dimensions & Specifications

What Is Shipped in an Open Top Container?

Operational Notes

• Loading method — cargo is typically loaded by overhead crane, gantry, or forklift through the open top. The tarpaulin is then lashed back over the bows.
• Tarpaulin condition — inspect the tarp before loading. Holes or weak spots will allow water ingress during the voyage. Always request a good-condition tarp from the terminal.
• Over-height surcharge — if cargo protrudes above the top rails by any amount, declare it to the carrier. The container will be placed in a special bay, and an over-height charge applies. Undeclared over-gauge cargo is dangerous and can lead to equipment damage.
• Availability — open tops are less common than standard dry containers. Confirm equipment availability at origin port early in the booking process.
• Lashing and securing — use the internal lashing rings to secure cargo. Overweight or unsecured cargo can shift during heavy seas.

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