Abstract: The present disclosure concerns a compaction apparatus having a hopper housing defining a hopper chamber to receive materials; a container storing the materials in a compacted fashion; a screw conveying the materials from the hopper chamber to the container and comprising a screw hopper segment extending in the hopper chamber; a partition assembly located between the hopper and the container; and a containment assembly comprising a flap mounted to the hopper housing and being movable between a loading configuration wherein the flap uncovers the screw hopper segment, and a containment configuration in which the flap at least partially covers the screw hopper segment to contain the materials in the hopper chamber.