I bought these with the understanding that I was buying the economy product not the heavy duty one. They get the job done as long as they are assembled with care. I have two minor issues to note. First is the assembly. Typically this type of box ships flat with some perforations where edges need to be separated from each other for folding and assembly. The perforations on these are shallow and it requires some care when separating them to be sure the cardboard tears along the perforation and doesn't rip the box in adjacent areas instead. The second is that I found the assembly instructions not at all clear. I didn't need them having assembled many boxes of this design over the years but if I didn't have that experience I think the first one would have been challenging. Neither of these are something that would keep me from buying more of these in the future but they are worth noting.
I have bought and used these boxes many time over the past 3 decades. While not as sturdy as the more expensive boxes they are economical and easy to stack. I use them for filing storage and moving.