is commercially available from e i du pont de nemours and company the advantage of using a film such as hytrel u00ae which is a resilient polyester is that its resilient nature provides a means for holding any spike port inserted therein in place during the transfusion of red blood cells from the bag to the patient in addition it will create a liquid tight seal around an object such as a spike inserted into the spike through material 12 or hytrel u00ae layer further properties of hytrel u00ae which make it preferable in the present invention are that it is autoclavable and it is red blood cell compatible in a preferred embodiment of the present invention a single layer of polyester elastomer film such as hytrel u00ae is folded inside the thermoplastic film strip layers 10 of the spike port tab insert the spike through material 12 preferably hytrel u00ae is sealed to layers 10 along the sides of the insert tab 13 providing a channel 12a through which a spike port can be inserted as shown in fig3 and 4 prior to using the bag a cut must be made by the user to provide access to the channel 12a which is sealed off during manufacture to provide a closed system as shown in fig3 and 7 a cut is made in the spike port tab at the end opposite the spike insertion point 14 this cut provides access to the channel 12a for.