Manufacturers using premade header bags or sealing their entire packages with Tyvek backing can substantially reduce costs by using Multivac's header bag packaging configuration. This option is available on two horizontal thermoform fill seal models including, the high-powered R530 and the R240. The machines use a standard flexible thermformable bottom web and two sealing webs. The first top web is a standard sealing film, covering the majority of the bag. A smaller Tyvek web is sealed in a strip at the top of the package. The strip can meet any standard dimension and is customized to further reduce Tyvek costs to help promote the efficacy of gas sterilization.