Pack for Heavy loads

My normal packweight is less than 20#, baseweight around 10-12, and has been as low as 7#.
I typically use a 4400 cu GoLite Pinnacle and have used a MLD Revelation for short trips.
I'm planning a 2 week climbing trip that will push my pack weight at the start of the trip over 40#, maybe 45#, with comsumables and climbing gear.
Can you recommend a light, high volume pack capable of those loads?
I'm experimenting with an SMD StarLite but it doesn't have the necessary volume and probably wouldn't like the load either.
I hate to go back to a +5# pack.
Tim