The Dunnage Bag may also be termed an Air bag, Bulk bag or PP woven bag. It may be employed to effectively protect cargo in transit by acting as a buffer between stacks of cargo. In particular the application of the tray, the whole board, bulk transport and the collapse of cargo containers and so on. It is widely used in containers, break bulk shipping, trailers, trains and other modes of transport. Using the inflatable bag reduces logistic costs, increases speed of loading and unloading, and greatly improves loading efficiency. The outer PP Woven bag is tough and solid. The gas tight inner bag is a LDPE (low density polyethylene) plastic multi-layer co-extruded quality product. It also includes a valve assembly.