I bought a set of 3 to put mattress covers and a duvet in. I also bought another product that looked more like a box with a lid. I've found them to work very well for anything that doesn't fit in the box ie anything that can be larger and needs to be pushed down. So for my needs it worked fine. I managed to fit 2 double mattress pads into a "chest". Seems durable and 2 zippers worked. If your item requires more space and is taller than its normal size, it will not be perfectly flat on top for another chest to fit nicely on top. He will sit on it but not exactly like the pictures.
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