Mailbag (noun)

1. A bag used by postal workers to transport mail.
2. A collection of letters, emails, or other correspondence sent to a particular person or organization.

Origin:

The word mailbag comes from the combination of the word "mail", meaning letters and packages sent through the postal system, and "bag", meaning a container used to store and transport items.

Examples:

1. The postal worker hefted the heavy mailbag over his shoulder before setting off on his route.
2. Every day, the radio host opens his mailbag to read letters and emails from listeners.
3. The local newspaper's mailbag was filled with letters to the editor about the proposed development project.
4. The town's mailbag was overflowing with letters from soldiers overseas.
5. The young woman carefully sorted through the contents of the mailbag, separating the letters and packages.