Dimensions: Big shelf comes flatpacked as 5 vertical supports and 5 horizontal shelves that slot together easily - you just line them up and push them together. (It's best to start with the outermost supports/shelves, to create a frame, and then push the other pieces into place.) No instructions or tools are needed. Cardboard is a living, breathing material. It can move, expand or shrink over its lifetime. It is very strong more details...