Are you going to do open carry, or concealed? Makes a big difference. Concealed carry with a backpack is a pain...shoulder carry gets screwed up by the pack straps, and often so is belt carry to the direct side or any part rearward.
If you're doing open carry, a crossdraw rig carried just to one side of your belt buckle, usually towards your weak-side arm. In other words, a right-hander would carry about 4" to 6" to the left of the belt buckle. This will probably be the fastest rig to draw from while wearing the pack, and there's another advantage: you can get to the gun with your left hand too, in a pinch. The extreme bottom end of the grip lines up with your belt buckle.
Given that you're in Alaska, and wilderness gun carry for bears is considered "culturally normal", that sort of open carry makes a whole lotta sense. When encountering others on the trail, be very friendly, give a wave with your right hand, keep your left away from the gun. You'll be signalling a non-violent stance despite an open-carry gun.
Check this out:
http://www.mernickleholsters.com/fc/fc3.html
That's a highly-molded leather crossdraw rig that holds the gun tight enough that no retaining strap is needed. In my opinion, that's what you want, or a kydex equivelent. If a bear jumps out at you at close range, you need to bring it to "bear" pretty damned fast.
Others:
http://www.huntercompany.com/hunter.html
http://jl-site.com/TuckerLeather/FieldHolster.html
http://www.fist-inc.com/holsters/holster/42.htm - dunno if they'll support a DA wheelgun in your gun's size range but this set of pictures shows how the general type works.
I'm not saying this is the "only" answer. But...it's a good one.
Other stuff: a weird psychological thing is that a very good looking gun/holster setup is "less threatening" to others than a piece of crap. It has a lot to do with public perceptions. If you can afford it, the fully-carved Mernickle above will be a very good option.
If you must go concealed, a fanny pack in the woods will get no notice whatsoever. It'll be slower to get to though.
Last thing: consider getting some raw leather, a punch and leather lace or paracord and brewing your own. While the results won't be as slick-looking (although with care and some conchos/beadwork you can do VERY good work), they'll be fitted perfectly to you, your belt/packstraps and your gun.
Here's the best leather rig I ever made:
It's one holster designed to hold two guns - a 22Mag minirevolver and a 38Spl snubby. The conchos cover up cross-lacing that tightens the rigs just below the triggers. When worn strong-side the two conchos are vertical, due to the forward cant.
The leather was folded around the guns, the edge-holes were drilled with a Dremel tool and leather lace around the edges finished it up. Came out looking pretty damned good and worked very well.
Edit: fixed picture link...