We sent my father to meet his god in a thin plastic lunch bag. We tied about 3 metres of cord to the seat frame and then tied the other end around dad in the bag. I measured the line needed on the ground to make sure it would clear the airframe and then made a practice run using flour in the bag. It worked a treat. Put the bag out the window.As the bag reaches the end of the line it jerks the bag and then splits and the contents disappear. Pull the line back in and no mess and no rubbish left. It worked for us.