These boxes have the strength for their size and can hold a reasonable amount of items. The lids do a problem with fitting tight with a full box of hanger files but that is a minor issue over all.
For the money this pack of 10 storage boxes with lids serve very well for packing fragile collectibles and some heavier pottery and miscellaneous stuff to pile up in my storage unit. Their size and the handles make them manageable for someone like me who does everything on his own. I'd buy these again.
This storage box product is best for file folders and other things that fit inside of the box. I found that when I put hanging files on the edges of the box that the lid did not fit snuggly over everything so either the lid needs to be made a little wider to accommodate the hanging file hooks or instructions need to be provided that hanging file folders are not recommended to be used on the edges of the box.
We have used these boxes for many many years for storing financial records-personal as well as business. They have held up in the heat of the attic and served their purpose for preservation.