It is fantasy, and not real. But my guess would be that he put the parcel in his invisible bag, thus making the parcel invisible.
Clifton chose to make his escape in "Invisible Man" by running away from the Brotherhood's rally and engaging in a street fight with police officers. Unfortunately, he was killed during the altercation.
So far it has not been possible to make people invisible - but this is an area of active research.
The Invisible Man.
Invisible Man was created in 1952.
Ralph Ellison wrote Invisible Man.
"The Invisible Man" by H.G.Wells was written in 1897.
He was caught because of his mistake .
Painting the Invisible Man was created in 2007.
The Invisible Man Returns was created in 1950.
Memoirs of an Invisible Man was created in 1987.
The Invisible Man - album - was created in 2001.
To See the Invisible Man was created in 1963.