DraconicArcania Hideout
 
Many things can create one,
It can be of any shape or size,
It is created for various reasons,
And it can shrink or grow with time.
What is it?

 
This is as light as a feather,
Yet no man can hold it for long.

 
What's black when you buy it, red when you use it, and gray when you throw it away?