Am I my stuff?

Like many of you, I am reading Eckhart Tolle's book "A New Earth". Of course, the passages that get the most attention from me are about the ego and its identification with "stuff". "The unconscious compulsion to enhance one's identity through association with an object is built into the very structure of the egoic mind." This explains how we have become the most consumer driven society that has ever existed. The questions I will now add to my client questionnaire are: How do you identify with your "stuff"? Will it diminish you to let go of your stuff?