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Hello! Yes, that is indeed my bike (you can read about it here).
The bag is made of thick duck canvas with a U-shaped plastic stiffener inside. This slots into two pockets at the front and rear of the bag.
Two elastic loops are fitted to the bottom of the bag. These loop around the cross strut of the rack and then loop around the tombstone. The heavy leather strap then slots onto the tombstone.
For light loads on the road (and, to be honest, even off-road), this is more than stable enough. It sometimes wiggles side-to-side, but it's never in danger of ejecting itself.
If I want to stabilize it further, I can lash the back of the bag to my handlebars (I use leather straps from an old Carradice bag). With that, it's absolutely rock-solid.
You can see more of Cory's amazing here: https://www.bikeradar.com/features/brazin-show-2023
Nice bike and a nice handlebar bag, apparently made by https://www.instagram.com/cbrennbags/
How is it attached, there doesn't seem to be any straps or a decaleur on the bar and the bag doesn't look like it has any kind of a frame in it, is the thick cotton stiff enough on it's own and how does the elastic cord at the bottom work with the rack? @JacqueLucque that's your bike, right?