Interesting question to me: is any country offering easy-to-attain diplomatic-courier status, such that I could (legitimately) label my laptop bag as a diplomatic pouch to protect it from search? (Yes, it's more complex than this; you'd have to be able to upload a manifest of what's in the bag and what it weighs to some service of that country's government, and then the country's embassy here would forward the manife…
[1] Article 27 Section 4: "The packages constituting the diplomatic bag must bear visible external marks of their character and may contain only diplomatic documents or articles intended for official use."