I ran into this issue myself. No standard 17" bag works. I *do not* own these, but these are the two options I was weighing on. The Everki Titan looks really nice, but is way outside of my class and a lot more money than I want to spend.
These are the two I was pretty confident would fit. One backpack style, and one cross-body briefcase style.
https://www.amazon.com/gp/product/B01IMXFJTIhttps://www.amazon.com/gp/product/B003ZWN8YAHonestly, I didn't buy anything yet because I can hold out to Christmas and give my wife something to buy for me.