Pros: Way more comfortable, better looking, and holds more stuff, more securely than my old, 1st generation Mule. Also, the vent back feature is outstanding. The expansion capability will be a big factor in the colder months when I shed layers as the day warms.
Cons: It might hold too much (is that a bad thing?). I find I am tempted to carry more items than I would have with my old Mule.
Recommendation: Overall, a great hydration pack from the masters, CamelBak. The Blowfish is highly recommended.
Pros: Holds lots of stuff and loads of water. Expandable and versatile. Good for epic trips.
Recommendation: I have owned this pack for several years. It has really served me well. I have used it for epic rides, hiking, xc skiing, downhill skiing. I just purchased a new one this year. Has some nice new features like velcro to secure the excess shoulder strap. More internal pockets and an internal pump holder. Better padded back and increased access to the bladder. You just can't go wrong with this pack.
Pros: Super storage space--adjustable/expandable.
Durable. Light and unobtrusive for having so much capacity.
Recommendation: This is a great pack. 100oz plus plenty of space for maps, guide books, camera, and chow. Zippered compartment lies flat when you don't need it and expands when you do, so it's like having 2 packs in one. If you've got a water filter, there's room for one and you can ride as far as your energy bars will carry you!