Thanks to all the chaps who responded. I have never had a frameless pack. I understand some alpine packs are frameless and can be quite big (5000cc). Is not having a frame a problem, carrying all that stuff?
On a side note, I have mountain hardwear 3rd dimension. It is solid as a rock in any condition but very bulky. Anyone also own a bulky synthetic and want to share some tips on packing for a multi-day trip?