What is the maximum amount of dry ice that can be mailed?

The correct answer indicates that the maximum amount of dry ice that can be mailed is 5 pounds. This limit is set by safety regulations for the transportation of dry ice, which is classified as a hazardous material due to its ability to produce carbon dioxide gas as it sublimates.

Mailing more than this amount could pose risks associated with the build-up of gas pressure within sealed containers, potentially leading to ruptures or other safety hazards during transit. This regulation is critical for ensuring the safety of postal workers, transportation personnel, and the public.

Understanding this limit is essential for anyone in the sales or shipping industry, as it helps maintain compliance with postal regulations and ensures that shipments are handled properly. The other amounts do not meet these regulatory standards for safe mailing practices.