Another vote for the ILBE. Built like a tank (heavy too) but very adaptable and can hold more than you will want to carry.
Also true. But the ILBE is so voluminous that you can carry large-but-light items (sleeping bags and pads) inside where they are protected from damage and the elements. And the full-length side zippers mean you can get to about anything quickly.Very true. Remember that just because you can carry more doesn't mean you should.