  To say that, according to the bundle theory, the identity conditions of individual mental states must be independent of the identity of the person who possesses them, is to say that their identity is independent of the bundle to which they belong. Hume certainly thought something like this, for he thought that an impression might ‘float free’ from the mind to which it belonged, but it is not obvious that a bundle theorist is forced to adopt this position. Perhaps the identity of a mental event is bound up with the complex to which it belongs. That this is impossible certainly needs further argument.