While I like the fact that these trays are cheap and 30% Recycled, the quality is so poor that they were not really worth buying. These trays would be great if you could actually stack them and lock them together. They are made to do that, but it just does not work. I knock these things over at least three times daily-and that is not even by bumping in to them-it's whenever I put more than a few sheets of paper on top!