Packing group is included on the outer packaging when?

• A. Always
• B. Never
• C. Only for domestic shipments
• D. If applicable

Answer: (D)

Packing group shows the level of hazard for a hazardous material and guides how it should be packaged and handled. You only put the packing group on the outer packaging if the material actually has an assigned packing group. If a substance doesn’t have a packing group or is exempt from PG requirements, there’s no PG marking on the package. So the right choice—show it only when it applies—matches how labeling rules avoid adding information that isn’t relevant. In practice, you’ll see PG markings for materials with PG I, II, or III, but not for those without an assigned packing group. The other options imply universal or geography-based requirements, which isn’t how the rule works.