Answer:
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
The more I appear The less you see. So riddle me this: What could I be?
It carries paper of the most important sort but also plastic, I'm glad to report. What is it?
What has to be broken before you can use it ?
What gets broken when you don't hold it?
In your fire you hear me scream! Creaking and whining yet I am dead before you lay me in your hearth.