The diplomatic bag (also called the diplomatic pouch) is a cornerstone of mission communications, allowing states to exchange materials with their embassies and consulates without interference from host or transit authorities. Its legal status is codified in Article 27 of the Vienna Convention on Diplomatic Relations (1961) and, for consular posts, Article 35 of the Vienna Convention on Consular Relations (1963).
Under Article 27, the bag must bear visible external marks identifying it as a diplomatic bag and may contain only diplomatic documents or articles intended for official use. In return, it shall not be opened or detained. The bag may be entrusted to the captain of a commercial aircraft, who is not considered a diplomatic courier but whose handover is facilitated by the receiving state.
In practice, the bag ranges from a small sealed envelope to entire shipping containers or crated equipment. States have used it to move cash, encrypted communications gear, weapons, and even vehicles. This breadth has produced recurring disputes: host states occasionally suspect abuse (smuggling, exfiltration of persons) but face a strict legal bar against opening the bag. The compromise sometimes invoked is to request that the bag be returned to its origin or opened in the presence of a mission representative — though the sending state is not obliged to consent.
The International Law Commission drafted a set of Draft Articles on the Status of the Diplomatic Courier and the Diplomatic Bag in 1989, but these were never adopted as a binding treaty, leaving the Vienna regime as the governing framework.
Key features in summary:
- Must be externally marked as a diplomatic bag
- Contents restricted to official use
- Inviolable: no opening, no detention, no X-ray scanning (contested in practice)
- Carried by a diplomatic courier with a courier passport, or entrusted to an aircraft captain
Example
In the 1984 Dikko affair, Nigerian agents in London attempted to smuggle former minister Umaru Dikko out of the UK inside a crate labelled as a diplomatic bag, but the crate was opened by British customs because it was not properly sealed or marked under Article 27.