Abstract: A package of filamentary yarn in the form of a wound cake of successive layers of the yarn, as may be produced by a forming winder, has an unlined hollow core. The lead end of the yarn extends for unwinding drafting of the yarn from the interior of the cake and the yarn tail end extends from the cake exterior. A heat-shrunk plastic film cover surrounds the sides of the cake from one end to the other so as to form a package therewith and a supporting doughnut shaped bumper ring is provided which has a transverse footing face of appreciable lateral area upon which the package may be stably supported upright. This supporting ring may be anchored to the lower cake end section by the film cover or may be secured to the cover in any suitable manner. A similar doughnut shaped bumper ring may be provided to fit over the other end of the cake for shipping.