What function do the metal hooks on the case serve?

The metal hooks on the case are specifically designed to hold satchel bags. Satchel bags are used by postal carriers to transport mail and packages while on their delivery routes. The hooks provide a convenient and accessible way for carriers to hang these bags securely, allowing them to easily retrieve or swap out filled bags as needed during their deliveries. This functionality is essential for maintaining organization and efficiency in the delivery process, ensuring that the carrier has seamless access to the mail while alleviating any potential discomfort from carrying bags directly.

Other functions such as securing parcels, organizing mail by size, or weighing mail do not align with the primary purpose of these hooks. While organization and parcel handling are critical aspects of a postal carrier's duties, the hooks specifically support the management of satchel bags, making it crucial to recognize their intended use.