I have purchased the clear boxes before and love them. They hold a lot of files and hey latched well(especially important when I am transporting files to and from the office). But the black ones I purchased don't latch as well one not at all on one end. If I purchase again I will do the clear ones. It is probably just a one off defect. Great product otherwise.
They do the job but they’re still plastic and made from petroleum. Cardboard isn’t strong enough and steel and aluminum and plywood are too heavy. There must be a better way. I’ll work on it.