Ten pounds isn't much - it's glass, it's heavy.  It's about 2 quart volumes of glass, maybe a bit more.  We are very happy with the glass.  We filled the bottom of the fireplace with black polished stones left over from a wedding - that took up volume so we put the glass on top.  We ordered two 10lb bags.  We love the new H-Burner with this glass and look forward to the ambiance and warmth this winter.  It is so pretty!

Pros: beautiful
Cons: none