mail·bag 
(mālbăg′)
(mālbăg′)n.
1. A large canvas sack used for transporting mail.
2. A bag suspended from the shoulder, used by letter carriers for carrying mail.
- down the hatch
- down the line
- down the road
- down the tube
- down the tubes
- down the tubes/tube
- down the wind
- downtick
- downtime
- down-to-earth
- down to the wire
- downtown
- downtrend
- downtrodden
- downturn
- down under
- downward
- downwardly
- downwash
- downwind
- down with
- downy
- downy brome
- downy mildew
- downy woodpecker