A bottle of one-piece construction includes a body having a shoulder, a neck finish and a neck extending from the shoulder to the neck finish. The shoulder and neck finish each have circular cross sections around respective axes, which preferably are coincident with a central axis of the bottle. A major portion of the neck has an oval cross section around a third axis, which preferably is coincident with the central axis, smoothly blending into the circular cross sections of the shoulder and neck finish. The oval cross section preferably is generally elliptical, having outwardly convex end portions and outwardly convex side portions extending between the end portions. The neck preferably has a substantially uniform wall thickness.