What document must accompany a package when shipping hazardous materials?

When shipping hazardous materials, it is crucial to provide a Material Safety Data Sheet (MSDS) along with the package. The MSDS contains important information regarding the properties of each hazardous material, including potential hazards, safe handling and usage procedures, emergency response measures, and information about proper storage and disposal. This document ensures that anyone handling the package, whether during transportation or upon delivery, is fully informed about how to safely interact with the item.

The other options do not provide all the critical safety information required for hazardous materials. For example, a shipping label is necessary for identifying the contents of the package and ensuring proper delivery, but it does not convey detailed safety information. A certificate of origin is related to the origin of the goods rather than their safety measures, and a customs declaration form is essential for international shipping to declare the contents of the package but does not include the necessary safety information specific to hazardous materials.