Which statement is true about the minimum dimensions for an overpack?

• A. They must be 4 mm x 4 mm
• B. There are no minimum dimension requirements for overpacks
• C. They must be 500 mm x 500 mm
• D. They must be 100 mm x 100 mm

Answer: (B)

Overpacks are outer containers used to group one or more inner packages for easier handling and protection during transport. The important point is that there is no mandated minimum size for an overpack—the regulations focus on the overpack’s ability to protect the contents, prevent leakage, and keep markings readable, not on a fixed footprint. That’s why the statement saying there are no minimum dimension requirements is the best answer. In practice, you choose an overpack large enough to safely enclose the inner packaging with appropriate cushioning and a secure closure, while ensuring all required labels and handling instructions remain visible. The other size options are not imposed rules; overpacks can be smaller or larger as needed, as long as they meet the performance and labeling requirements.