Let's see--4 water bottles-at least 20 oz./bottle--why not just use a Camelbak? Plenty of water, and room for a few tools. But maybe it isn't "cool" for a road rider to use a Camelbak? I know I sure enjoy having plenty of water on a hot day. And once ya hit 50, who really cares what you look like (well, maybe some do, but I could give a hoot!)