I have two stackable IKEA file cabinets from the old EFFEKTIV line. They are wood (or pressed wood) and are in great shape/nice looking. They are meant to be stacked on top of each other -- you could use the larger one on its own, but there are screw holes on top where I attached the other unit.
Measurements of the larger bottom piece are about 33 inches long, 17 inches deep, and 20 inches high. The stackable top piece is about 16 inches high. These pieces are a bit heavy, owing to the weights inside (to keep them from tipping). I can help carry from the backyard. Also, you'll need a hatchback or a large trunk.
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