I use my 50 oz camelback and two bottles on long solo rides. I can ride for 3 to 4 hours before needing refills. The weight of the camelback has never been an issue. What I really like about the camelback is that I can fill the bladder with ice with some water to fill the voids, then 2 + hours later I still have cold water. The camelback also has webbing that I can put a jacket and tights under when it warms up.