The offshore frame container removes the top and side walls (and sometimes the end walls) on the basis of the standard container, retaining only the bottom plate and four corner posts. This open design breaks through the closed nature of traditional containers and provides greater flexibility and convenience for loading and unloading operations

Some offshore frame containers adopt bottom frame separated structure, where the columns are welded to the top frame and bolted to the bottom frame. This design makes it easy to separate the bottom frame from the columns when loading and unloading non-detachable bulky cargoes, lifting the top frame and columns together and loading and unloading cargoes directly on the bottom frame.