Oh its just a bag going inside the bag. You slip the liner inside the ostomy bag and kind of spread it apart inside with your fingers. Then you afix the liner over the opening and snap the two pieces together. It catches the poop and when you want to empty just open and pull out the liner and toss it in the toilet. Your ostomy bag is clean. They are supposed to be biodegradable and wont clog plumbing but i would feel better by using the trash can. I am hopin i like the samples. If i do im ordering a box....colomagic makes them.