material 6 enters the second chamber 4 the rate and force of flow of the fluid material 6 is slowed due to the increased volume provided by second chamber 4 as the second chamber 4 fills with fluid material 6 and the pressure of the fluid material therein increases the discharge seal 10 breaks allowing the material 6 to exit from the package in a controlled fashion so that the application of the contents of the package can be performed in a satisfactory manner seal 8 may produced by applying a heated die to the external surfaces of the two sheets of material specifications of the seal and the temperature of the die which are required for the seal to burst at the proper pressure are determined by the contents of the package and the material from which the packet is constructed the material may be a plastic poly film by way of example if poly vinyl stearate film which is 2 2 mil thick may be used an example of this material is sold under the trade designation james river c z 216 seal 10 may be formed by a quarter inch wide die heated to 180 u00b0 f with a pressure of 106 pounds per square inch p s i applied for 0 5 seconds for this specified material this combination of temperature pressure and dwell time will give the desired peel and bursting pressure for seal 10 of 0 5 p s i seal 12 may be formed from this material by using a straight line die of three lines heated to 240 u00b0 f.