Which statement best describes the minimum outer dimensions for dry ice packaging?

• A. They have no minimum outer dimensions
• B. They must be at least 4 mm x 4 mm
• C. They must be at least 100 mm x 100 mm
• D. They must be at least 500 mm x 500 mm

Answer: (A)

The important point here is that dry ice packaging rules do not set a minimum size for the outer packaging. What the regulations focus on is making sure the packaging can safely contain the dry ice and vent CO2, and that it can withstand transport through required performance tests. Because shipments may use varying amounts of dry ice and different packaging designs, there isn’t a mandated smallest outer dimension. You simply design the package so it can hold the intended quantity, meet the venting and structural requirements, and pass the required tests. That’s why there’s no minimum outer dimension.