these particulas storage boxesare more than adequate for paper document filing and even book storage. while they coud not actually be rated as "sturdy" they are certainly not flimsey. i have used them to move as well. they are a convenient size to carry and store. common sense packing allows one to deal with weight capacity issues.in my opinion if you can carry it comfortably AND it had reasonable capacity it becomes a winner. this is such a product. i recommend it especially to women.