My camelbak has more than adequate room to carry camera gear in it should I decide to do so. The bladder is protected behind an insulated divider and that portion of the pak has drain holes to compensate for condensation/bladder rupture. IMO it would take quite a bit of foolishness to rupture the bladder.
Seems to me that finding padding/dividers you would like to have in your pack to separate gear would be the way to go. I've seen a MF kit that had compartments that velcro'd together to form whatever system you needed to have. Don't recall what it was called, but I'm sure it's easily locatable again.