On long rides I often use a 70 ounce camelbak for water plus carry 2 waterbottles filled with Gatorade. But those are for long solo (and unsupported) rides.
The MS rides usually have rest stops at relatively low mileage points where you can fill your water bottles. And I believe that most of the MS150 rides are 75 miles done twice, not 150 in one day.
But - in answer to your question, riding with a camelbak should not be that noticeable. Yes, you know it's there, but it shouldn't slow you down. And if it is more comfortable for you to drink from it, it might be better for you than water bottles.
--- Denise



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