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In the UK, it鈥檚 called a 鈥渄iplomatic bag.鈥� In the US, it鈥檚 a 鈥渄iplomatic pouch.鈥欌�� But regardless of what you call it, it鈥檚 totally secure. These containers are used by diplomats to transport classified materials across country lines. Barbara Bodine, the former US ambassador to Yemen, has personal experience with this secret mail system.

(Image: In this photo from circa the 1950s, a state department worker seals a diplomatic bag containing government correspondence which will be sent to US embassies all around the world. Credit: Three Lions/Getty Images)