Originally Posted by
gauvins
Could you elaborate a bit on your rear rack? (what model, what capacity, why not a "conventional" rear rack?)
It's a
Carradice Bagman QR Expedition with support. It's sort of what the
Erlen saddle bag support was designed for as well. This one has a 10Kg (
22 lbs) weight capacity but it can be increased with some extra struts.
Basically it's a support for a (larger) saddlebag. I use mine with a
Carradice Super C (
23L / 1403 cu inch) but there are tons of other options like a Swift Zeitgeist and many others.
I ride this bike with a front bias, so with a rando bag in the front + two smaller panniers and a saddlebag in the back. A frame bag is coming up. It's slightly more aerodynamic and I like the saddlebag for ease of access while riding. It's really easy to strap extra things to it as well.
Plus I think it looks cool. 
But a saddlebag like this mostly rides really nicely because it is in line with your center of gravity on the bike. So you hardly notice it while riding.
Here is a different bike with the same bags and rack:
