I used to work in mountain shops and I sold a LOT of packs. My advice is to try on a lot of packs, and to try them on with plenty of weight in them. It's a very good idea to have the rest of your gear in hand first and then get a pack that suits that load. No pack fits everyone. Some folks may like a particular pack and it may look great to you but not fit you well at all. And fit is the most important thing. Pockets and all that don't mean squat if it doesn't fit you well. If you can buy your pack from a store with a good return policy, you can load it up at home and walk it around the block to see how it really feels. Also, remember that "features" add weight. Every pocket, every zipper, every accessory strap - they all add weight. The simplest designs are the lightest. Any of those packs that weigh 6 lbs and more are massive overkill for normal backpacking. I wouldn't even look at anything that weighs over 4 lbs, and I'd focus on packs that are closer to 2 lbs.