33 C.F.R. § 150.628 How must the operator label, tag, and mark a container of hazardous material?
Title 33 - Navigation and Navigable Waters
The operator must label, tag, or mark each container of hazardous material with the identity of the hazardous material and the appropriate physical, health, reactivity and other special condition hazard warnings. The only exception is for portable containers for transferring a hazardous material from a labeled container to the work site for immediate use by the person who performs the transfer.
Title 33: Navigation and Navigable Waters
PART 150—DEEPWATER PORTS: OPERATIONS
Subpart G—Workplace Safety and Health
Hazard Communication Program
§ 150.628 How must the operator label, tag, and mark a container of hazardous material?

