The fabric is thin and allows light to pass through. There seems to be cardboard in the part that hits my back. It's a reasonably priced product, and its durability remains questionable. Without using it, I don't know if this product is sturdy.
A photograph is a pickup belt part of the upper bag. Mounting location is different in right and left. Furthermore, the left side inclines. On earth what kind of check is a quality check by the passage in this? It is clearly the defective article if this is in Japan.