The FBC Mail Sack is a medium-sized, utilitarian sack made from a heavy-duty, dark gray fabric with a slightly weathered texture, featuring the Federal Bureau of Control's logo stenciled in white on one side. It has a simple, cylindrical shape with a drawstring closure at the top, made from a thick, braided cord. The sack's surface shows subtle signs of wear, including minor scuffs and a faint dusting of otherworldly residue, hinting at its use within the Bureau's surreal environment.