In other words, diplomatic bags in principle enjoy immunity, but they still have to go through a host state's legal procedures. (thecommentator.com)
Britain, like every other state, wants its own diplomats operating abroad, and its own diplomatic bags and embassies, to be protected under international law and therefore tinkers with the principle of inviolability at its own peril. (blog.politics.ox.ac.uk)
From the chest of drawers he pulled out the British passport, sent by diplomatic bag to Ankara a week earlier. (bookbrowse.com)