Interesting....I like both. I do lots of self-supported centuries, and 2 bottles just isn't enough liquid for me. I hate stopping at some store because I buy cheap powder drink mix and mix my drinks at home. I hate riding back home because my home is a dorm room and I have to ride through 4 miles of constant stopping that kills my avg. speed. If I'm going on a shorter ride, bottles are just more convenient.

I love the Camelbaks that don't look like backpacks...the ones that are just liquid storage and one pocket at the most. Those are the most comfortable and easiest to deal with.