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20 Ft Tunnel Containers 20ft tunnel containers, also referred to as double door shipping containers, have the ability to be accessed from both ends of the container. This makes it easier to load and unload cargo. They are typically found in a brand new 'one-trip condition. They are made from a standard 40ft high cube container that has the bottom removed and an additional 5ft added with double doors. High Cube Double Door Tunnel container The High Cube Double Door Tunnel Container is