A blow-molded container includes a bottom member, a plurality of sidewalls, a spout for receiving a closure cap, a handle section proximate to the spout, and an upwardly converging neck member. The plurality of sidewalls includes a first pair of opposing parallel sidewalls that are spaced apart by a first dimension, a second pair of opposing parallel sidewalls are spaced apart by the first dimension, and a third pair of sidewalls that are spaced apart by a second dimension that is different than the first dimension. The upwardly converging neck member couples the sidewalls to the spout and has a convex transition section defining a continuous curvature that extends from the sidewalls to the spout.