There's a pic of the bag a few pages back. It's medium-sized, but it's noted that it doesn't have any padding so don't put a laptop inside it, and to keep it away from intense sunlight.
The art book is very, very bare bones compared to the official art book released in Japan, which has over 500 pages. The one we get is just character art, some character sketches(no alternative character designs or anything like that), some pin ups, and that's it. Soundtrack is also very minuscule compared to the 20th anniversary soundtrack or the 3-disc OST.
For anyone that might be interested, the 5-disc 20th anniversary soundtrack is available to purchase digitally in the Asian PS Store, under "add-on" for the Chinese version of the game.