on the forming die is sufficient so as to form a liquid barrier when fused and in this particular description sufficient to resist the penetration of a hydrocarbon oil to provide the necessary resistance the weight of the polyolefin layer compared to the total weight of the container is at least about 16 this minimum weight requirement is discussed in more detail in the examples however if too much polyolefin is used then the cost of the finished container becomes excessive in addition if too much polyolefin is used the production rate of the number of containers per unit of time is reduced because of the additional time required to deposit more of the polyolefin also too much polyolfin can cause heat transfer problems when heating treating the final container next the coated forming die is placed in the stock chest holding the mixture of cellulosic fibers and water dispersible polyolefin fibers again the application of the vacuum causes the water suspension to form a solid fiber mixture layer on the already formed layer and the water passes through the wire mesh into the vacuum chamber when sufficient water has been drawn to obtain the required weight the die is removed from the stock chest and the water in the chamber is drawn out the amount of the mixture deposited upon the polyolefin layer is sufficient to provide at least the necessary strength so that the filled containers can be stacked atop each other.