How? Where?

Not much space for a full size bottle even on a large frame. I dont always want to carry a backpack. How do you carry a bike mounted bottle? I was thinking perhaps on the seat tube at the back?

Anyone tried these?

http://www.evanscycles.com/products/fabric/water-bottle-ec121138

I bought a cheapo £3 mount and drilled a new hole right at the end. I’m on small frame, and even then I’m only able to get a 500ml bottle in (and a specific one at that).

I usually just use a Camelbak.