Q 270: The spell
binding allows you to trap creatures in various ways, one of which being:
It doesn't say whether you can or can't release the creature by breaking the object in which they are contained. I would assume you cannot, given that even Greater Dispel Magic can't free them. So, is such an item effectively unbreakable? Or would it merely be a bad thing for the creature trapped inside (who is now in thousands of pieces after you broke him...)
Edit: Also note the similarities (and thus unnamed differences) between this and
trap the soul. Trap the soul specifically calls out freeing someone trapped inside by breaking the gem, while Binding does not.