One of the problems we are facing now is our reliance on expensive technology when we travel. Who is going to check their bag with their laptop, headphones, cameras, etc. and risk it being stolen? For most, these items have to be accessible during the flight as well. It will always be in the carry-on. Add that to the clothing for a short trip, and you've got everyone carrying 2 bags onto the flight. And only a few want to give up the little bit of room to stretch your feet out, so both bags go up.
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