What is the highest level of classified material that can be transferred via hand carrying?

The highest level of classified material that can be transferred via hand carrying is classified as Secret. This designation allows for the secure transport of sensitive information that, if disclosed, could cause serious damage to national security. The guidelines regulating the handling and transfer of classified information are designed to ensure that only authorized personnel with the appropriate security clearance engage in the hand-carrying of such materials.

Top Secret information is held to a more stringent standard and typically cannot be personally hand-carried unless under very controlled conditions, often requiring additional measures such as escorting by personnel with higher security clearance. Confidential information, while still protected, is generally considered to be the least sensitive category and is subject to its own set of transfer protocols. The term "Classified" is broader and encompasses various levels of sensitivity, making "Secret" the correct and specific choice for this context.