Last spring I picked up a Craft "High-Performance Bike Light Cycling Jacket" for the same purpose. No pockets, ultra-light, warm enough to get me into the high 40s with a short sleeve jersey underneath, and as packable as it gets. They've updated the jacket to this model (or so it seems as some features have been added): http://shop.craftsports.us/performan...ens-35663.html

This is also very similar: http://shop.craftsports.us/performan...ens-31657.html