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purchased three sets of these to store different types of paper in one of our closets. it's sturdy, stacks well, and inexpensive.
the only issue i have this this product is that it has a 'lip', which while sometimes useful, does not allow paper to stack perfectly flat. the front of the units, where paper is put in / taken out is the part where the lip is like a small ramp, raised up slightly. while this is not a huge issue for us, as we are storing paper mostly used for crafts, it will create a 'memory' bend in thicker paper that may be an issue depending on your intended use