It seems everyone with a Camelbak or similar puts it in the tankbag. I don't as my tankbag is filled with clothes. You don't mention what bike you ride, but if you have an RT (maybe some other models too), you can place a water bladder in the glove compartment and thread the hose to the handlebars or to a tankbag as I do. Works great, keeps the water cool as it is out of the sun (unless you stop for a period of time in which case engine heat heats it up fairly quickly), keeps it off your back, and is drinkable while riding.
I carry two collapsible water containers (2 litres each) for the campsite.
I carry two collapsible water containers (2 litres each) for the campsite.