Osprey makes pretty legit packs hiking packs. I'd get one if i got into hiking a bit more.
http://www.ospreypacks.com/en/category/mens
If youre looking for a more daypack type bag then check out Blackhawk tactical gear. Also check out the MOLLE packs they got. I've never tried them but ive seen some at the store and they feel pretty durable.
http://www.blackhawk.com/catalog/Tactical,44.htm
Badlands also makes pretty legit hunting style packs if youre into that style. I like them because they fill the niche between a traditional backpack and a fullsize bag, and they have integrated bow and rifle holders on them. I'll probably opt for one of these when i get enough cash.
http://www.badlandspacks.com/index.php?go=home
If youre goin for an all out do everything bag, go with the Osprey. Theres a reason why pretty much the entire staff at philmont uses them and why they rent them out to scouts. Most comfortable and adjustable bag ive ever worn.