What should you use to have an original container built when it is unavailable?

Using a Special Packaging Instruction (SPI) drawing is the correct approach for having an original container built when it is unavailable. An SPI is specifically designed to address unique packaging requirements for various munitions items, ensuring that the packaging meets safety and regulatory standards tailored to those items. These instructions provide detailed specifications and design parameters that guide the development of appropriate containers that can adequately protect the contents during storage and transportation.

This ensures that the container is not only functional for its intended use but also compliant with any applicable regulations imposed by the Department of Defense or other governing bodies.

In contrast, existing packaging guidelines may not cover specific needs related to unique items, a replacement packaging standard might not accommodate the specific characteristics of what is being packaged, and custom packaging approval involves a more complex process that may not be necessary when a suitable SPI already exists to guide the original container construction.