5.11 Tactical Rush 24 is probably the best for the dollar value, I dont like alot of 5.11 gear but this one they got right. Has alot of features and pockets on it. Comfortable to wear; I have had mine for 4 years and still in good condition, I use it daily. It is good for a range bag as it is not too big but has all the pockets required for the job. You can also put in all your gear, camera, gps, batteries, sunglasses, water, and a dozen other things. The pockets are well thought out and the pack really works in most applications. I would definitely suggest this to anyone, and in fact at least two people I work with have purchased the same pack after seeing mine.
TAD Gear makes some nice packs but are alot more then the 5.11. They have some great features as well and are slightly bigger.
Camelback makes some decent packs and they have become pretty popular among the military guys now. Lots of pockets, lots of options.
For the serious rucker there is Kifaru, this is for the live out of your pack situation in my opinion. They are expensive but awesome, I think it is quite a bit excessive for range bag use and you have to buy extra pockets if you want to keep things seperate.