What is the maximum volume of dry ice allowed per package?

The maximum volume of dry ice allowed per package is specified to be 5.5 pounds. This limit is established to ensure safety when transporting dry ice, as it sublimates into carbon dioxide gas, which can displace oxygen and pose a suffocation hazard in enclosed spaces. Additionally, transporting larger quantities could increase the risk of pressure buildup in sealed containers, leading to potential safety issues. Therefore, the regulation is in place to mitigate these risks while allowing for practical use of dry ice for cooling and preservation purposes.