You’re familiar, I suppose, with the expression sine qua non. No doubt you’ve used it in an argument for your high school debate club. Consider the expression and the lost luggage joke to ask yourself what, beyond self-awareness, is essential to your identity.
You’ve packed much into the suitcase of your life, including “nonessentials” that you carry wherever you go.
What are the sine qua nons that make you an identifiable individual?