When shipping hazmat in an overpack, what must be done?

• A. Overpack Must Be Packed, Marked, And Labeled According To DGR
• B. Overpack Must Be Shipped By Sea
• C. Overpack Must Be Stored Separately
• D. Overpack Does Not Require Labeling

Answer: (A)

Hazmat rules apply to the whole packaging system, including the outer container. An overpack is just an outer shell that groups or protects inner packages, but it does not waive the requirements for proper packing, marking, and labeling. The contents inside still follow the Dangerous Goods Regulations, so the overpack must be packed securely and must carry the same hazard communication as the inner packages.

In practice, this means the overpack is prepared so it cannot leak or be damaged, and it is marked and labeled according to the DGR. The outside of the overpack should show the appropriate hazard labels, the correct shipping name, and the UN number that match what’s inside, and it may also bear the “Overpack” marking if applicable. This clear communication helps handlers and emergency responders understand the risks, regardless of how many individual packages are inside.

Shipping mode, storage practices, or disregarding labeling do not change this requirement. Therefore, the overpack must be packed, marked, and labeled according to DGR.