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Basically it's sitting stool rather then step stool. But you can step on it and it will hold more then 200 lbs. If you drop 200 lbs on it, i believe it would collapsed. But normal use, maybe can hold even 400 lbs. It's because the way it was made. There's no way that even 1000 lbs of force crush those two sides, i would say that the top pannel is the weakest, and stool would collapse there. If you put top panel thick more then 1 and 1/2 inch (4 cm) or more, i believe that it would hold a car for tyre change ?