diplomatic bag
noun /ˌdɪpləˌmætɪk ˈbæɡ/
  /ˌdɪpləˌmætɪk ˈbæɡ/
 (British English) (US English diplomatic pouch)
- a container that is used for sending official letters and documents between a government and its representatives in another country and that cannot be opened by customs officersTopics Politicsc2