We use these boxes to store our old files. They are sturdy but can only be handled by a very strong person. We have made shelves for them as putting them on the basement floor doesn't work too well as they gather moisture and then fall apart or get moldy. But this price as compared to buying plastic bins is a good compromise.
We really like these storage boxes for our company's filing/archiving needs. We store our personal documents from past years as well. They are easy to put together and they are sturdy. We are able to stack them on top of each other (5 or 6 high) and they do not bend or crush. We have had these file boxes stored in our attic for at least 10 years -- and they are in as good a shape today as they were when we first constructed and filed them away. The quality of the cardboard is strong and sturdy.
These boxes are great. Simple to go together (once you've done one and figured it out). Hanging folders hand just over lip like they do in a file cabinet so very convenient. Great for storage too.