I am in love with my Camelbak! I really don't notice the weight on my shoulders and back at all. Mine holds 50 ounces. It's worth it to have easily accessible water because so far I can't do the water bottle thing without stopping. I still carry two water bottles though...one with Gatorade and the other just plain water. Today I rode 35 miles and drained both the Camelbak and the Gatorade bottle (it was 80 degrees today...a week ago it was in the 30's and 40's...now suddenly it's summer!) The Camelbak was definitely my friend today. I don't care if some people think using a Camelbak looks silly...for me, it's perfect!