Empty Quarter alternative name for Rub' al Khali, a vast desert in the Arabian peninsula, extending from central Saudi Arabia southwards to Yemen and eastwards to the United Arab Emirates and Oman.
empty sacks will never stand upright those in an extremity of need cannot survive; saying recorded from the mid 17th century.
empty vessels make the most sound foolish and empty-headed people make the most noise (a vessel here is a receptacle such as a drinking-bowl). Saying recorded from the mid 15th century.
See also better are small fish than an empty dish.