A device used to simulate the characteristics of a multi chambered lung consisting of at least two air chambers, each chamber having a first and second interconnected panel portions, an inflatable bag positioned between said first and second panel portions so that the inflatable bag is interposed therebetween and an air interface connected to said the chambers for allowing air to be exchanged with an external device. The interconnected panel portions flex as the bag is inflated and they also provide a restoring force that deflates the bag when the squeezing force is removed. The panel portions corresponding to each of the multiple air chambers are also interconnected by connecting panel portions that provide mechanical coupling between the plurality of air chambers.