A cubic container that could be used for example for green waste. Put it on some feet (didnt make those yet) and put it in the sink to allow the dirty water to poor trough it while the green waste stays in (For later collection).

Other usecase could be to put plants inside it and a small bucket underneath to wet the ground for plants.
 

Link to onshape for donwloading in different formats/copy (container 1): https://cad.onshape.com/documents/567b10c4864b31f50d19c323/w/a65914ce3ff4c8bb2ea80f22/e/e6bdfe761090e140f13ddf6b?renderMode=0&uiState=66fe959d9e734b470755aca2