I’ve been experimenting with this for years. Used everything from velcro to duct tape. So far, this method using nylon wire ties is the simplest, quickest and most easily reversible I’ve found for modifying your ski touring rucksack. Idea is one of the best places to carry a small camera such as Canon G is in a case pouch mounted on your rucksack shoulder strap.
First, find a small camera case or pouch you like (big box store helps, bring your camera and check fit, ordering online is tricky). Plan on mounting in a vertical orientation as a top loader. Some cases have small gussets behind the zipper so they don’t flop open completely. Those are best because your camera, radio or GPS unit can’t fall out while you’re unzipping, but anything small and functional will work. Here is the DIY:
(Note, I use this type of rig year-around, for everything from hiking to adventure travel. Give it a try. You won’t miss trying to dig your camera out of your pack every time you see something interesting.)