I went for a less expensive women's Camelbak, the Aurora: http://www.camelbak.com/Sports-Recre...11-Aurora.aspx
I am very small and I wouldn't want anything any larger. It fits well and is easily adjustable. I am happy enough, though I am not delighted with riding with something on my back. It kind of bugs me.
Trek Madone 4.7 WSD
Cannondale Quick4
1969 Schwinn Collegiate, original owner
Terry Classic
Richard Feynman: “The first principle is that you must not fool yourself and you are the easiest person to fool.”