I fly back and forth to China every year, and always pack the full 50 pounds allowed. These are great, really better than I expected. Sturdy, and the handle lifts up through four fold-over cardboard flaps on the top, so it is really more sturdy and secure than you might think just from looking at the picture. These are perfect, and much cheaper than buying more suitcases. And easy to breakdown and store when I get back home. I always have 2-6 large bags with me. Since these boxes weigh much less than a suitcase, I can get almost 50 lbs of my stuff, instead of 10 pounds just for the suitcase.