The Windbreaker is a patented metal bracket with two fittings that slide into the corner castings of containers on top of adjacent stacks. Two windbreakers are place on one side of a container before it is placed on the top row of a stack. When the container is lowered into position the hook elements drop into the corner castings of the adjacent container, securing the stacks together. A technical report of the independent research organization TNO shows that a horizontal connection of a row of containers provides a very high level of protection against high winds