A diplomatic bag is a bag or container in which mail is sent to and from foreign embassies. Diplomatic bags are protected by law, so that they are not opened by anyone except the official or embassy they are addressed to.
[British]regional note: in AM, use diplomatic pouch
diplomatic bag in British English
noun
a container or bag in which official mail is sent, free from customs inspection, to and from an embassy or consulate
Examples of 'diplomatic bag' in a sentence
diplomatic bag
Their weapons and other equipment were dispatched through diplomatic bags.
Times, Sunday Times (2012)
The translation was shipped back by diplomatic bag.
Times, Sunday Times (2014)
Often lofty neoclassical or religious themes came back in the diplomatic bags.
Times, Sunday Times (2012)
Each week the embassies dispatched a courier to take the diplomatic bag to the home country.