An I-shaped cargo restraint device for an intermodal shipping container having an internal wall with corrugations comprising: a central member having a pair of ends; a first wing associated with one of the ends for securing to one of the corrugations; a second wing associated with the other of the ends extending parallel to the first wing, the second wing being spaced apart from the first wing by about 5⅜ inches for securing to an other corrugation adjacent to said one corrugation; and a handle associated with the second wing. The cargo restraint device includes a top surface and a plurality of strengthening ribs disposed thereon. The cargo restraint device including a strengthening lip disposed on the top surface extending around a perimeter of the cargo restraint device. A method of restraining cargo in an intermodal shipping container having internal corrugated walls.