Which containers do not require labels according to HAZCOM standards?

Portable containers for immediate use are exempt from labeling requirements under HAZCOM standards. This exception is designed for situations where chemicals transferred from labeled containers are used right away. Since these containers are typically filled and emptied quickly and are intended for immediate application or use by the employee who filled them, the regulation does not mandate labeling.

In contrast, all other options involve containers that are either meant for storage or that have the potential for being reused, hence needing to have clear, appropriate labeling to prevent accidents or improper handling. This ensures that employees are aware of the hazards associated with the contents, promoting safety in the workplace.