Unless you plan on digging fox holes, ditch the etool. The MOLLE 2 is pretty dang comfortable. It is heavy though, and will last your trip. There are better packs out there, but they will cost much more.

If I was doing that route (for some crazy reason), I would seriously look at getting a cart to pull. You will have really long stretches without water sources. You will need to carry a lot more water than you will want on your back.
_________________________
I've taken a vow of poverty. To annoy me, send money.