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I ski with a backpack all the time--
Bottom line: a secured pack, and stuff it with a fleece/extra t-shirt. The camera is going to be fine. Personally, I'd rather keep one or two light/short primes + camera (one mounted) if I'm skiing to ski (perhaps 35mm and 85mm) rather than a big, long mounted zoom.
Another consideration: Wear mittens as the outer, and fingerless, lightweight gloves (or just really light/tight gloves) as liners. .
Good stuff, Russ. I use the overmit/liner combo all the time, especially with Reynaud's, I throw a heat pack in there too.
I've done remarkably well skiing with a Tamrac Velocity 9 and can use the center camera slot for extra jacket, etc. I add a Tamrac bottle carrier accessory for some water without a mouth tube. The rig is super quick on the draw, including mounted 70-200/4, plus another lense and room for a flash, phone and filters.
Good for the lifts, easy to swing in front.
But hiking with too much weight on a one side sling is a bear. I balance by slinging (OpTek) the other shoulder to split the load.
My latest piece of gear is a Contre Jour ski pack I intend to take to BC this winter. I'll be skiing with beacon & shovel, climbing and descending significant vert. But I can't pass the opportunity to photo my mates, and do scenics. I'm debating my minimum lens selection, but still fear with a heavy pack, and a younger crew, that I may be lagging.
My quick review of the Contre Jour is that it is heavy, but well proportioned. It sits on my back well, and handles the weight. Bladder is an after thought, only 100 oz. Overkill straps of heavy material. Good zipper access to midsize organizer (places for batteries, cards, gloves, snacks), and room for a jacket, shovel and lunch. I like the shoulder and waist straps, very clean and ergonomic. Ski attachments look good, but I haven't tested that yet. There's crampon capability and gear straps too. I give it an A-
Anyone have any experience with http://buy.cottoncarrier.com/cotton-carrier-strapshot-p/211cps.htm
It would be a nice adjunct for ski touring.