Carradice Saddlebags

Ah found it, now see what you meant now, look like I can have a matching saddlebag with my GB handlebar bag;

Managed to find a bit more information, it's basically their version of the Carradice SQR system;

The GILLES BERTHOUD rack-mount saddlebag is an elegant fine-luggage alternative to the standard pannier rack.

This bag comes in two sizes (narrow and wide) and two colors (grey and black).

Both sizes of the rack-mount saddlebag us the same proprietary rack. This rack attaches to the seatpost with a standard MTB handlebar stem (supplied)

A shim is included to fit the stem to seatpost sizes 26.8, 27.0, or 27.2. You must specify which size post you have .

The bag attaches to the rack with two toe straps on the top and a quick-release nylon strap on the bottom.
This bag is is made of strong, water-resistant cotton with top-grade leather trim and reinforcement.