Hey Guys, I'd like to find a way to rig up a gas tank that can be mounted to the seat post (behind the rider), or perhaps to the frame just above the rear tire. I'd like a ~1/2 gallon size, cylindrical tank of some kinda. I've googled around a bit and can't find anything stock that would fit my purposes. The intent is to keep the tank off the horizontal tube of the bike for looks really, or perhaps a spare tank of gas for long rides. My idea currently is to use a sealed up paint can to hold the gas and tap it for the fuel valve. The problem with the idea is really the gas cap. I can't seem to find, at least easily, a gas cap kit (male and female) that I could custom fit the paint can with. Pirate Cycles sells a gas cap kit for $80, but I just can't see paying that amount of money. Any ideas would be appreciated.