It doesn't look all that much bigger than the E45 I have had for the better part of 20 years!
We bought two E45 boxes and two slightly smaller boxes (E36?) to use as side cases. At the time we had a pair of Yamaha XJ900F's. Audrey's was black and a 1989 model and mine two years newer and blue and white. We had the Givi wing racks and could share the side cases.
I have used the same E45 on the old GT750 interchangeable with all the other bikes right up to Döra.
And now the next generation.
Looks good too.