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40ft Tunnel Containers - ISO Regulated and Ideal For Shipping Or Storage A tunnel container is a standard shipping container that has double doors at both ends. This makes it simple to carry cargo and use to store items. Research Local Regulations. Before purchasing a shipping box, contact your local zoning office to find out the kinds of containers that are allowed and if any permits are required. High Cube Double Door Tunnel containers This brand new 40ft high cube container features double