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A century ago, a woman who owned 20 outfits and 10 pairs of shoes was wealthy indeed. Today, she's probably standing in front of her closet saying, "I have nothing to wear!"
One fact of today's economy is that clothing and many other manufactured products are very cheap, comparatively speaking, and are widely available, even in Third World countries. This, combined with pressure from airlines to minimize fuel use and carry less luggage, means we may soon be carrying relatively little luggage on each trip.
Another item in the future traveler's bag may be one or more radio frequency identification (RFID) chips, which can help automate and speed up the process of getting travelers and their suitcases to the right destination at the same time.
Finally, security systems may identify passengers by their biometrics -- for instance, scanning a thumbprint.