I have the 13 litre one. You can pack it so full that it barely fits between the hoods, but as it is it seems to work. I haven’t ridden like this mind you...
with the appkit handlebar bags I found when loaded the straps have a tendency to slide off of either end of the bag. That can be solved by using a strap or zip tie to hold the two straps together on the underside of the bag. Hope that makes sense...
I have the 13 litre one. You can pack it so full that it barely fits between the hoods, but as it is it seems to work. I haven’t ridden like this mind you...