I regularly haul my gear all over the place, so my advice for back packing would be something like the
WG-4 GPS, for a number of reasons, the first being portability and the fact that you can just pull it out of your pocket and snap a few frames without slowing down your travelling companions. Plus I just love pulling up my pictures after the trip and locating them on google earth so I can see where I've been and what I saw there. After a week long trip that can be a real help in identifying which image was taken where. In good light the IQ is excellent, we've sold prints from out older Option W80. I don't own this camera, I still use my 5 year old Optio W90. So I'd have one of those for "everyday" kinds of shots, even if I was taking a DSLR.
For me taking a DSLR back packing is full of bad memories. Having taken my kids up hiking in Little Yoho a number of time, there have been times I was ready to just chuck the SLR off the side of the mountain, on hot sweaty days, climbing 3 or 4000 feet. You're already dying, but because of 3 or four pounds of DSLR you're dying worse. So I'd limit the DSLR stuff to one Pelican case and either my Sigma 18-250 or Pentax 18-135, with maybe the 21 and 40Xs in a small case with an extra battery,
K-3 and DA 18-135 in small case...
I simply won't risk my DSLR in a soft case. IN this case, it's waterproof and shock proof. I can leave the case outside my tent in any weather. It's very rare that on the trail I want the DSLR. But in the morning when you get up and at night before sunset after you've set up camp, is DSLR prime time. Most of the time the DSLR is buried in my pack, except when travelling with other photographers.
On the trail use a waterproof shockproof camera.
It'll do anything in a pinch.
Option W90 slideshow.