My wife's Cannondale Synapse uses a Streamliner rack, and it works well for her. For my CAAD9, I have a Carradice Super C Barley saddlebag that I attached to the B-17 saddle with the usual loops and a home-made contraption that works like a Bagman. I did a 2 day ride of a little under 200 miles, with one night in a motel, and the Carradice was big enough for the purpose -- it held minimal tools/tire repair stuff, a little food, a rain jacket, very light shorts and a shirt, maps, wallet, phone.

I simply contacted Carradice directly via internet to order the bag and they were nice to deal with.