Our 4GV Boxes, or Variation Packaging, meet and exceed all U.N. specifications and certified by the Department of Transportation (D.O.T.). These 4GV Packaging are more rigorously tested, allowing more flexibility in shipping approved inner packaging / containers. Our UN Boxes are designed to ship Packing Groups I, II, III packed with inner containers containing Solids or Liquids, depending on the weight and regulation requirements of each material being contained. 4GV boxes are considered 4G outer boxes in terms of IATA requirements. Hazmat Boxes must be packaged properly to ensure complete compliance. Please refer to the Packaging Instructions provided with the purchase to ensure maximum safety.