If this is what you want I vote for the Snugpak Rocket Pak - I use one for multi-day hikes, and I think I got it from Redflare via this website. Its an extremely good pack for heavier loads, goes modular if you want that, though you want to play with the configurations a bit to get used to rigging them comfortably. I don't actually go modular much if at all (attach the side packs to the yoke), I use the Rocket Pack for my heavy hauling, 40 lbs or more, and that usually comes midway through an early season hike when younger Scouts realize they're carrying far too much (this year I'm getting better at this, I vow to strip unnecessary weight off Tenderfoots in the parking lot before we leave for the trailhead - like Willem Dafoe in the movie "Platoon". Guaranteed to scare the hell out of watching parents though). Its huge - I have yet to pack it to full capacity. Its comfortable for me, I don't use the hip belt, and I like the integrated rain covers (choice of two, brown and some kind of camoflauge design).

While there's alot of overlap between my hiking, backpacking and BoB contents, the contents are easily shifted about, but ymmv. Have a look at the Kelty MAP 3500, do a search in this forum for views and reviews, for $99 or less its a great deal, purchasable from Amron International. The MAP 3500 is my everday pack, I have two others that function as full-time BOBs. Very pleased with this very functional pack.

Usual disclaimer: no interest or reimbursement from Snugpak, Redflare, Kelty, Amron or anyone else, just a happy camper.