As airlines crack down on carry-on bags and overhead bins on planes, what's the most popular luggage type these days? It's not small carry-on bags, which now often get gate-checked. CBS News travel editor Peter Greenberg has more. 

(Photo credit: Getty Images)

<p>As airlines crack down on carry-on bags and overhead bins on planes, what's the most popular luggage type these days? It's not small carry-on bags, which now often get gate-checked. CBS News travel editor Peter Greenberg has more. </p>
<p>(Photo credit: Getty Images)</p>

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