IMO, the RAID isn't a pack for 60-70 pounds, even with the frame-sheet. It's an assault pack or 3 day pack. The only time I had that much weight in an assault pack was a trip to a 3-gun match and I used my Eagle A-III to haul the ammo.
How much are you willing to spend? If you can afford it, go high-end and get a Kifaru. It is worth the money (I've had two..one I bought and the other I traded for the one I bought). I have numerous other Kifaru pouches and stuff. Their stuff can't be beat.
Going down from there into the more affordable realm of things would be a Camelbak BFM. It's about 2800 c.i. and can haul a bunch of stuff.
You might also look at the Tactical Tailor MALICE pack. Based on the ALICE rucksack, it's been modified and upgraded. I've never seen one, but I've heard good things about them, and the TT items I have seen have all been good.
Full Disclosure, I am a Tactical Tailor dealer, so my opinion is a bit biased. ..same with Camelbak and Eagle. Kifaru only sells direct to the end-user.