I do delivery moving grocery boxes up and down stairs on a daily basis, with each box weighing around 20 pounds. Cart fits 3 of those boxes stacked and is still sturdy, no signs of bending or wobbling.Only issue are the wheels. They are super loud when rolled where the whole 3 blocks radius can hear, disrupting the neighborhood. If they added rubber to the wheels or some sort of quiet-rolling technology, I would definitely give 5 stars and buy again.