I seem to remember as a kid seeing a lot of frame bags sold for bikes. Something that attached to the top tube and seat tube but still allows two bottles to be carried on the frame and still use my DT shifters. It seems like there is a fair amount of out-of-the-way storage that could be had here, but there doesn't seem like there are many options out there for this style of bag any more. Is there something I'm missing that this doesn't work well? Any places that sell a nice bag of this type that doesn't break the bank?