The perfect camera backpack?
No, there is no such thing.
I own a lot of camera bags, including several backpacks, and it’s starting to become a problem. First there is the small issue that I love bags, obsessively. Second is there I don’t have room to store more bags.
In the best scenario imaginable I would be happy with six bags of which I have found three. Maybe you think that’s a lot but let me explain.