Small Frame - no room for 2nd bottle cage

[ny biker]

Velo, this still may not be an acceptable solution, but I frequently carry 2 water pouches in addition to my regular water bottle. I've also been known to pour the water from the pouch into my empty water bottle so that I can access it more easily while I'm riding.

That's how I would expect to use it. After both water bottles are empty, pour water from the pouch into one of them, then fold it up and stick it in the seat bag or handlebar bag.