compact and sturdy enough to hold 4 reams of paper

This is a very compact unit. I have already filled it with various papers at my printer and it provides easy access. The mesh allows me to see the contents and the sides prevent the paper from sliding out. The trays stack on top of each other but don't actually fasten together. They are sturdy enough to hold full reams of paper without tilting or bending. If you wanted to attach them together you could use some cable ties on the sides, but I haven't found the need for that. I am completely satisfied with this purchase.

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