I have been pleasantly surprised by these organizing cubbies. They are really very sturdy, And a lot larger than I had pictured. I was a little bit confused as to how to assemble them, because the main image of the listing had a different orientation. Upon going back to the listing I saw the other options and as soon as I realized the right way I was able to assemble them within about 2 minutes.
The shelf's are made out a material that reminds me of a milk jug, but they are very strong. In fact, my daughter has absolutely stuffed hers full of notebooks, random papers and books and even with it being overly full there is no bending or morphing at all. The unit is extremely durable and the strength of it is the most impressive feature to me.