Ahh Bushwalking - right up there with Photography...
Sorry I haven't snooped around the site for a bit and have only just found this thread.
I did a 7 day very hard walk back in February, the full Frenchmans Cap circuit. Images from my 3rd post
here, with links to my other 2 posts on this subject.
I had 2 batteries and wish I had 3 - or MORE! Run out of power and it's GAME OVER!
I had two 1Gb cards with me and shot in medium. I should have had more cards and shot in fine or raw. Now I can, because I have one of
these and I will be taking it on any trip I do. I still need to work out what to do about a spare battery for it - and won't be wasting battery power on MP3's. Still, more cards a good option - small and safe.
I had the D70 and the 2 kit lenses. I wish I had something better than the 70-300G. Still, the images are okay for snaps and I won't be looking to sell any.
I had a screw-on 67mm 4x macro filter but didn't use it much - wish I had a 105 Macro. So many fascinating subjects in the macro range when walking.
I have a small Lowepro bag big enough for the D70 + kit lens and spare batteries, cards etc. My kit includes a lens cloth, a small pack of cleaning pads like pec pads - for lens cleaning - I do not intend having to do a sensor clean in the middle of nowhere. It also includes the remote.
I have a tripod I take, seen in one of the photos at the above link. I carried the kit lens in a separate bag made of wetsuit fabric - actually it's a wine bottle bag for keeping wine cool, but serves the purpose of protecting the lens quite nicely. (Now there's a market - lens bags made of wetsuit fabric!)
And as well as all this, I had with me many plastic bags and rubber bands. When it was raining, and when we swam across the Franklin River with our packs, I had the camera gear triple-wrapped in plastic bags, each one well sealed with rubber bands.
When actually walking, a lot of the time I had my camera around me and the kit lens in a pocket of my vest.
In my pack, when my gear was there, I kept myself aware where the gear was - not in a rear pocket in case I fell backward and landed on it. And not in the bottom - so I could get to it, more importantly so I didn't thump it on the ground when I took my pack off for a p!ss or to ge the tripod off.
Also generally tried to pack things around it well like clothing or whatever, not the stove or fuel bottle or other hard things.
You know, common sense stuff.
My dream kit for walking would be a D200 with 18-200VR for me and the D70 with 105 macro for my wife, and a 50mm f1.4 in the pocket with a 1.7x tele. (providing that's all compatible).
And if I were rich and a bit fitter and could afford the room in the pack, the
80-400VR - but at 1340g it WOULD make a difference.
Actually it's not as expensive as I thought it would be... (sshhhh!)
Oh, one other thing I had was a small toweling cloth wrapped in a couple of sandwich bags, so I always had a DRY cloth - lens cloths aren't very good at removing water (rain, usually) from the filter on the end of your lens.
Last comment - be careful how and where you change lenses so you try to avoid dust bunnies. It was that walk that I went on that I learned dust could cause a problem to a DSLR. Now I'm an experienced low-pass filter cleaner.