Each vessel, tank, box or receptacle shall be constructed of metal and shall be watertight and shall have a capacity of not more than thirty gallons; and shall be provided with a handle on the outside thereof and a tight-fitting metal cover. No container shall be loaded to such an extent that the weight, including its contents, exceeds one hundred and twenty-five pounds. (Ord. 173 NCS § 14.22; prior code §13.19.)