5. For this estimate the pack is divided into a main body and a fragment that is known to lie on top of lead ingots. The average dimensions of the main fragment are 17.0 by 6.88 by 0.60 m. The volume (70.125 m3) times the density (7860 kg/m3) gives a weight of 551182.5 kg. Together with the weight of the small fragment (3.35 x 2.15 x 0.30 m = 2.16 m3, times the density = 16938.495 kg), the total weight of wrought-iron bars is 568165.995 kg (568 tons).