A trash compaction system comprising: a trash receptacle through which trash is input; a compaction chamber in which trash is compacted, the compaction chamber having a closeable receiving opening in communication with the trash receptacle to receive trash into the compaction chamber and being generally horizontally disposed, the closeable receiving opening being closeable by a movable compaction chamber cover to define open and closed states of the compaction chamber; a compaction plate against which the trash is compacted; and a compactor mechanism operatively coupled with the compaction chamber to compact trash in a direction which is generally horizontal and which is generally perpendicular to a direction in which the compaction chamber receives the trash; wherein the compaction chamber is movable in a generally horizontal direction and in the open state the compaction chamber is extended against the compaction plate ; characterised in that : the compaction chamber cover is slidable into the closed position against the compaction plate to enclose the compaction chamber in a compaction cycle; and the compaction plate , the movable compaction chamber , and the movable compaction chamber cover are configured to form a closeable ejection opening which is openable in an ejection cycle by the compaction chamber and the movable cover when both of the compaction chamber and the movable compaction chamber cover move away from the compaction plate in a direction opposite to the direction in which the trash is compacted to eject the compacted trash from the compaction chamber . a trash receptacle through which trash is input; a compaction chamber in which trash is compacted, the compaction chamber having a closeable receiving opening in communication with the trash receptacle to receive trash into the compaction chamber and being generally horizontally disposed, the closeable receiving opening being closeable by a movable compaction chamber cover to define open and closed states of the compaction chamber; a compaction plate against which the trash is compacted; and a compactor mechanism operatively coupled with the compaction chamber to compact trash in a direction which is generally horizontal and which is generally perpendicular to a direction in which the compaction chamber receives the trash; wherein the compaction chamber is movable in a generally horizontal direction and in the open state the compaction chamber is extended against the compaction plate ; characterised in that : the compaction chamber cover is slidable into the closed position against the compaction plate to enclose the compaction chamber in a compaction cycle; and the compaction plate , the movable compaction chamber , and the movable compaction chamber cover are configured to form a closeable ejection opening which is openable in an ejection cycle by the compaction chamber and the movable cover when both of the compaction chamber and the movable compaction chamber cover move away from the compaction plate in a direction opposite to the direction in which the trash is compacted to eject the compacted trash from the compaction chamber . the compaction chamber cover is slidable into the closed position against the compaction plate to enclose the compaction chamber in a compaction cycle; and the compaction plate , the movable compaction chamber , and the movable compaction chamber cover are configured to form a closeable ejection opening which is openable in an ejection cycle by the compaction chamber and the movable cover when both of the compaction chamber and the movable compaction chamber cover move away from the compaction plate in a direction opposite to the direction in which the trash is compacted to eject the compacted trash from the compaction chamber . <EOS>