The glass is very thin and the vase is much more fragile than I expected it to be.  In fact, it was just sitting on the floor when it all of a sudden cracked from bottom to top.  When I picked it up to put it back in the box it completely shattered!  I don't know if there was some sort of chip or flaw in the bottom of the vase that went unnoticed.  It was the weirdest thing.