A 4G fiberboard box certified for shipping hazardous materials in accordance with United Nations regulations. In some embodiments, the 4G fiberboard box includes an outer shell, a three-piece partition assembly, a top insert and a bottom insert. The outer shell has a width and a length, each no greater than ⅓ of 46 inches. Thus, the 4G fiberboard box is shippable in a 3×3 configuration on a standard 46″×46″ pallet. The three-piece partition assembly is disposed within the shell and has four compartments, each compartment configured to receive a container storing hazardous material. The top insert and bottom insert are also disposed with the shell, with the partition assembly positioned therebetween.