You can stack it, however, consider what you have stored inside first. If you need to move the box around, there are also integrated handles on the side. The mesh is fine enough for you to look through and easily spot the documents that you need, while a rail on the inside of the box allows you to hang folders without them from getting caught or jumbled-a common complaint with hanging file boxes.
These mesh file boxes are some of the best to keep papers organized as well as accessible.