The FBC Mail Tube is a sleek, cylindrical container with a matte black finish, featuring subtle metallic accents that hint at its bureaucratic importance within the Federal Bureau of Control. Its design is minimalist yet functional, with a secure, screw-top lid and a small, embossed FBC logo near the base. The tube's surface is smooth with a slight texture to provide grip, and it emits a faint, otherworldly glow from within when activated, aligning with the game's surreal aesthetic.