I have a pair of these for longer rides where I'm not sure if refills will be available. 33oz each.



My other option (which I don't think is made anymore) is called a "Pocket Monsoon". This was a flat, square plastic "bottle" that would exactly fit in a jersey pocket. I can't remember how much each of them held, but I'm guessing 16-20 oz each. Not that it helps you any.

I'd venture that most people here would consider a handlebar bottle to be uncool, but I'd rather be uncool than dehydrated. Do whatcha gotta do!