Baled goods are stowed on single dunnage at least thick. Often, strapping/lashing and dunnage bags are used in combination to secure chemical products. As improperly secured cargo is a safety hazard, dunnage bags improve road safety. For use in the chemical industry paper dunnage bags can be polycoated. A polycoat will make the dunnage bag resistant to specific chemicals. Dunnage bags are placed in the void between the cargo. Dunnage bags can be used in all modes of transportation. The interior equipment helped to eliminate the need for customer-supplied dunnage. Dunnage bags are placed in the voids between the cargo items. Dunnage bags are susceptible to pointed and sharp articles such as nails. Dunnage airbags consist of closed chambers made from an elastic film filled with air. Dunnage Bags are not approved for rail transportation of hazardous materials in the United States. Dunnage can also refer to a structural platform for mechanical equipment. Dunnage bags can be used in all modes of transportation; road, railway, ocean or air. Dunnage bags (also known as "air bags") are used to keep unit loads in place.