In my various acquisitions and purges, I've ended up with two extra Loyal Designs randonneur handlebar bags. Both are ~10-1/2" wide, 6-1/2" deep and 8-1/4" tall. Both are the traditional "berthoud style", heavy canvas and leather. Loyal Designs is Phil W. here in the East Bay.
I have two. One is grey and has never been set up with a decaleur. The other is blue and is currently set up with a Berthoud decaleur receiver, which I could remove or include depending on your needs. I've used the blue one over ~3000 miles of riding. Since everything second-hand should be half-retail, and since retail is around $350 for a bag of this style, I'd sell either one for $175 + shipping. I would prefer not to sell both. Let me know if there's interest and I can send photos.
Bill Lindsay
El Cerrito, CA