They're more than strong enough to withstand the 50-pound loads we move with two of them; I haven't tested them with anything heavier. My problem with them is that they don't actually block. They fit together but don't snap together. We had to squeeze them to hold them together. They roll very gently. In fact, it would be nice if they had a brake on at least one wheel when we load items on them. Everything else fits.
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