A method of forming a package and a package are provided. The method includes placing a main die and a dummy die side by side on a carrier substrate. The method also includes forming a molding material along sidewalls of the main die and the dummy die. The method also includes forming a redistribution layer comprising a plurality of vias and conductive lines over the main die and the dummy die, where the plurality of vias and the conductive lines are electrically connected to connectors of the main die. The method also includes removing the carrier substrate.