Sack.full of mail

A "sack full of mail" is a common idiomatic expression that means a large quantity of letters or messages, often in a physical sense, such as a postal sack or bag filled to the brim with mail.

The phrase is often used to convey the idea of a significant amount of communication or correspondence, and can be used in a variety of contexts, such as:

• "The post office was overwhelmed with a sack full of mail on Monday morning."
• "The company received a sack full of complaints from customers about the new product."
• "The journalist spent hours sorting through a sack full of letters from readers responding to her article."

The phrase is thought to have originated from the days when mail was physically carried in sacks or bags, and the idea of a "sack full of mail" was a tangible representation of a large quantity of correspondence. Today, the phrase is often used figuratively to convey the idea of a significant amount of communication or correspondence, rather than a literal sack of mail.