Sturdy enough to hold lots of hardcover books small enough to not get too heavy. Lots of space for describing contents. Assembles easily and folds compactly for repeated uses.
I bought two sets of these boxes to help move and store my classroom materials when I was pink slipped in my district. The boxes were easy to assemble (6th graders were able to put them together) and sturdy enough to hold my volumes of books and binders. The lids are useful for stacking the boxes. A great buy!
I bought file boxes from Staples in the past and they were wonderful to put together. These boxes were so difficult that I actually had paper cuts all over my hands and could not complete putting all the boxes together. Whatever your budget spend a little more and get a more user-friendly product