Diplomatic bag
A diplomatic bag, also known as a diplomatic pouch, is a container with certain legal protections used for carrying official correspondence or other items between a diplomatic mission and its home government or other diplomatic, consular, or otherwise official entity. The physical concept of a "diplomatic bag" is flexible and it can take many forms (e.g., a cardboard box, briefcase, duffel bag, large suitcase, crate or even a shipping container).