The FBC Mail Sack is a medium-sized, utilitarian canvas sack with a rugged, weathered appearance, featuring reinforced stitching and a sturdy leather base. It has a simple, drawstring closure at the top, with the FBC logo stamped prominently in a muted, bureaucratic green. The fabric shows signs of frequent use, with subtle stains and wear patterns that hint at its role in the mundane yet mysterious operations of the Federal Bureau of Control.