15 kg. A box of 500ml iced tea weighs 15 kg, and the capacity of a box of iced tea is 15 bottles, so 15 bottles of 500ml iced tea weigh 15 kg. The main raw material of iced black tea is black tea. Black tea occupies a very important position in the international tea market, but it is unknown that the earliest exported black tea is Zhengshan small black tea produced in Mu Tong Village, Xingcun Town, Wuyishan City, Fujian Province (formerly Chong 'an County).