I believe you are correct!!
Not much I could find online on the 828, but this matches exactly. Mine even has the little pullout pouch on the front flap.
Mine has the following inserts:
- 3 "bridge" type inserts that go front to back
- 2 inserts that form a shelf at each end of the bag
- 2 short inserts that divide the 2 sections in the center
Does that match yours?