Just heard about this new British brand, Slicks. They've launched what looks like a neat little backpack for cycle commuters. Not cheap, even by Rapha standards, but might be worth a look for hardcore commuting types.
Apparently the design includes separate suit and shirt holders, plus shoe pockets etc. Everything except hot and cold running power-shower, basically. Clearly designed for long-distance commuters with proper jobs, rather than spoilt PR types who can commute in their scruffy work clothes.
Early reviews seem pretty positive - not sure it will ever displace my beloved Patagonia - but a brand worth watching.
More info here: http://www.slicks.cc/