I was looking at hydration paks with more than 70oz (2 liter) capacity today and the Osprey Raptors are pretty nice. They seemed pretty versatile. I was also looking into the Camelbak M.U.L.E., which is also nice. The weight difference between the two is a few ounces.

I definitely need some storage space but I feel like carrying three liters of water is going to be super-heavy, especially on longer rides with a lot of climbs.