Seems to be a great pack - Exped Lightning 45 Backpack - Women's

I got this pack because I thought I might need the extra capacity for an early winter backpacking/climbing trip. As it turns out, I was able to fit everything into my existing pack, so ended up returning it. However, it is a very well built pack with an interesting design. It basically has an adjustable external frame. The frame is pliable enough to be bent to the exact shape of your back. The compression system is a bit more complicated than on most other packs, but works well and allows for many different lashing options. The pack is quite light for its size. A lot of climbers use this pack, so it would be nice if it had an option for gear loops rather than pockets on the hip belt, but that's a small detail.