I have a 46l on the n/s & a 33l on the o/s, that way the bike is symmetrical when looking at it from the rear.
I have a photo of them looking at the bike the same as you've posted Fat Rat but not on this tablet, if you want me to, I'll post it when I get home tomorrow.......if I remember!
The photo is on this forum somewhere but I can't find it.