ENPAC Poly-Overpack® Salvage Drums Enpac's Poly-Overpack® salvage drums are molded in durable polyethylene so they won't rust or corrode. All models are stackable, nestable and have twist down lids for secure closure. Tight Grip "T" models have molded in handles for easier lid rotation. Meets UN/DOT requirements for Group 1H2/X295/S rated usage. Ideal for transporting hazardous liquids.