A body bag is a specially designed large plastic bag which is used to carry a dead body away, for example when someone has been killed in an accident or in battle.
...the prospect of young soldiers coming home in body bags.
body bag in British English
noun
military
a large heavy-duty plastic bag used to contain and transport human remains, esp those of battle casualties
body bag in American English
a rubberized bag sealed with a zipper, used for transporting a human corpse from a war zone, accident, etc.
Examples of 'body bag' in a sentence
body bag
The cops found so much money they had to call for help and use body bags to carry it away.
The Sun (2006)
Outside, the wounded were being put in ambulances and the dead placed in body bags.