It was easy to assemble in a short time. Together it is very strong. I put in as many as 12 "boxes" to house a number of interesting wooden puzzles I've made during the pandemic. I call it my pandemic puzzle! The material is a metal frame and something like mylar for the sides and bottom. It is not massive on the sides and bottom, but only gives a little. It seems like it has a reasonable weight when properly connected. I'm not sure if it can be used as a bookshelf. Maybe not so durable. But for many other things. Yes. :)
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