Originally Posted by Phil_gretz

...absolutely. Sure. It's an excellent innovation for when you cannot remove a bottle from a cage to drink while riding (safely). When you crash or go over top of a major obstacle on a mountain bike, caged bottles are invariably ejected and lost. As were any contents of your jersey pockets, generally. So, I say, yay for Camelbaks!

For purely road riding, they're unnecessary, because the same function is accomplished just as well with frame mounted bottles and sundry items can fit in a jersey pocket or small seat bag.

Bottles offer distinct advantages over the hydration bladder. Foremost, one can have two different drinks in two bottles. Perhaps one with an energy/electrolyte mixture and another for water. In this way, one can keep track of overall hydration better. Plus, bottles are easier to clean.

The downsides for road riding have been explained already, weight, ventillation, etc.

Plus there are cultural norms in cycling. Ignore them or not.

OP, folks have explained the reasons why not to use a Camelbak on a road bike: practical and functional, as well as cultural. You can choose to be different. No one really cares... You will find that most adults aren't fixated on what other people think.

OP, how do you keep your Camelbak's hydration bladder clean? That would be a helpful input.