what can't you live your home without?

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before we leave for school or work, we check our bags and make sure that everything we need is in it. however, at times, because we rush alot, we forget some things. on our way, or once we reach our destination, we realize that we left something at home. then, we suddenly feel uncomfortable and "incomplete". what would be that "something" that you left that makes you feel "incomplete"? could it be your mobile phone? your lip balm?