Osprey, North Face, Nathan, Salomon, Inov8, UltrAspire all do backpacks/waistpacks with long runs in mind. Just depends what fits you on whether you'll like them or not. Problem is there aren't many shops that stock a big range so can be hard trying them on for fit! I've bought a few blind, liked some, disliked others, returned for refund or resold on eBay.
Think it's worth getting the female specific ones as with the men's ones the shoulder straps are often too widely spaced. You also have the choice of a bladder or bottles and that's just down to personal preference...
Look at www.ultramarathonrunningstore.com to compare them against each other and see some brands you might not have heard of before.