The width of the back is about 8 times wider.
Since the back width changes according to the amount of documents, you can store documents compactly at any time.
The cover does not spread.
It fits perfectly with the contents, whether there are few or many documents.
Even if you put a lot of documents, the filed documents will not curl and the cover will close perfectly.
Even if you stack it on your desk, it will not collapse.
* If the back width becomes wider, the width of the outer dimensions will become slightly smaller.