gasbag, envelop, mail, aerogram, flap, postcard, shoebox, pocket, mailer, preaddressed, more...

release, expose, uncover, reveal, open

manila, kraft, more...

nuclear, large, sealed, stamped, white, outer, brown, smaller, thick, long, yellow

outer covering,   small packet,   postal enclosure,   paper package,   mail component,   documents carrier,   balloon part