The concept is about making an alive bag. Our stomach just like a bag digests the food we eat in and toilet also digest the excretions we produce, all other wastes are digested by trash bags. I got inspiration from the forms of these three objects to create the metal structure of the bags. And used mechatronic device to push the elastic fabric on the surface of the bags move outward inward, which looks like the bag is digesting. I chose two kinds of fabrics for the surface of the bag. One is smooth and shiny elastic fabric.