Answer:
You throw me out when you use me and take me in when you are done.
You are my brother, but I am not your brother. Who am I?
I start new then become old. Start clean but be one dirty. I usually start big then become little.
I spend most of my day eating white. When I am quick enough I get rewarded with fruit and something blue. In a dark room with blue walls I run from the ghosts that roam the halls
My full powers come when my makers are dead. I await a heavy hat to put on my head. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.