I had Fast Back Systems overnight me a Double Century seat bag. It works great. Needs a little fit&finsh to keep the second bag way from the idler&chain.
BTW here is the link to the pressurized bladder I told you about. Its called a Moflow by Polarpak. It squirts out the water.
http://www.polarpak.com/hydration.php?it=moflow The idea here is to run this as a second water source for cooling oneself off. Landis won the Tour-de-France by dumping dozens of bottles of water on himself. This past weekend I use the same strategy and dumped some from water from my dog-water bottle on me prior to attacking some hills, or when I wanted to hammer down and make a good show passing someone.
I don’t know the price of this Moflow, or if it works as expected, but I like the idea. Im thinking about a strategy of putting energy/hydration formula in my bladder and ice water in the Moflow. It should reduce the need for having to drink water and risking over hydration which forces a pit-stop to the restroom. I would run the moflow in one side of the Double Century and a regular bladder in the other side. The moflow would might need a hose extension to be able it to reach my legs. And maybe something a bit stronger then a badge retractor to keep it in place, perhaps a mini scuba retractor. Just thinking out loud here. Bicycling is a FUN hobbie.
Terry