Abstract: A machine arranged to insert material to be composted into an elongate elastic bag. The machine is arranged to insert an elongate perforated pipe into the elongate elastic bag with the material. The perforated pipe is fed from an air tight container through a conduit into the bag. The machine may have an expander mechanism to enlarge the opening of the elastic bag with the expanding mechanism defining a tunnel through which the material will be forced into the bag. A reciprocating plunger movable within a channel or hopper forces the material into the elongate bag. The machine is arranged so that the composting process may commence when there is material available to only partially fill the bag. When a bag is filled partially, the plunger is moved to a position at the entry of the tunnel to seal the open end of the bag and a media may be applied to dispense the media into the material via the perforated pipe to commence the composting process.