Definition - What does Container mean?
According to OSHA regulations, a container is "any bag, barrel, bottle, box, can, cylinder, drum, reaction vessel, storage tank, or the like, that contains a chemical hazard. For purposes of the section, pipes or piping systems, and engines, fuel tanks, or other operating systems in a vehicle, are not considered to be containers." This definition comes from the OSHA Hazard Communication Standard at 29 CFR 1910.1200. It should be noted, however, that some state 'right to know' laws do consider pipes to be containers.
Safeopedia explains Container
Chemical manufacturers, importers and distributors are required by law to ensure that each container of hazardous materials that leaves the workplace must be labeled, tagged or marked clearly to show the level of hazard presented by the chemical. In the event that the shipping container is the actual container holding the hazardous chemical, the container must be clearly labelled to show the hazard level, while not interfering with any DOT stipulated shipping labels.