The density of sand varies from 1500 kg/m3 to 1700 kg/m3, depending on how much water there is. We could assume that the gourd's capacity is cca 50 litres = 50 dm3 = 0,05 m3. So, from formula m = ρ * V, we get: m = 1500 * 0,05 = 75 kg (165,3 lb). So Gaara's gourd weights approximately 75 kg or...