I am finding that I definitely have preferences in pack specifics . Due to an ah-hum chronological disorder lol lighter is definitely a tall order . I prefer the u shaped yoke system for weight distribution/comfort . I also have found that I have a definite appreciation for narrower packs that don't extend pass my shoulders . I originally purchased military surplus which are always heavier albeit pretty much bomb proof . I recently purchased a Camelbak pack that checked all the fore mentioned specs . I found it to be possibly the most comfortable pack I had carried to date . Just this afternoon I purchased a Gregory pack . The store allowed me to load it with things from their shelves that closely replicated the things I would carry on my outings . Don't know the exact weight loaded but it was by no means to capacity which this time of year would include warming items . Needless to say it carried exceptionally well and followed me home . Im getting away from the tactical look as I prefer simple clean lines . Straps for cinching the bag when not full and a water bottle pocket or two more than suffice these days . I discovered a couple years back I like dump/pouch style packs with smaller kit bags inside . The Gregory I picked up has all of these but with a zipper that goes completely from either side of the well padded back panel and around to the other . This allows the back panel to be unzipped all the way around except for the bottom . This feature allows to full access to the bags contents without even having to open the top of the bag and dig through to get what's needed . Sooo what if any specific features have you grown to appreciate in a pack .