What does Boxing Day have to do with boxing?
biodegradable bi·o·de·grad·a·ble (bī'ō-dĭ-grā'də-bəl)
Capable of being decomposed by biological agents, especially bacteria.
Material that, left to itself, will be decomposed by natural processes.
Note: The use of biodegradable packaging is supposed to reduce the volume of waste in landfills.