...whatever works for the individual...
You say you are using a 100oz camelback. That's over 6lbs of static weight. I would rather not have that on my back, hour after hour day after day.[/QUOTE]
I absolutely agree with the first statement.
Regarding the second statement...Most people will drink more often when wearing a hydration pack so 6 lbs. of static weight hour after hour, day by day will only occur if you don't drink at all. Actually, as you tire, you'll drink more and the more you drink, the lighter the pack gets...seems to make sense.