What is another word for plain brown wrapper?
Pronunciation: [plˈe͡ɪn bɹˈa͡ʊn ɹˈapə] (IPA) 
"Plain brown wrapper" is a phrase that implies something is being kept hidden or disguised. Some synonyms for this phrase include "bland packaging," "inconspicuous covering," or "unremarkable casing." Other similar phrases that convey secrecy or anonymity include "cloak of invisibility," "veil of secrecy," or "mask of anonymity." In the context of law enforcement or censorship, "classified packaging," "confidential covering," or "restricted case" could also be used. Regardless of phrasing, these terms all communicate the sense that something is being concealed or kept private.
