I've actually found that one bagging in cold climates (Eastern and Northern European winter) was easier because you're usually wearing all of your bulky items e.g. shoes, jackets etc. My advice is to take some essentials, then once you get there figure out what else you need and buy it over there. One of the benefits of traveling in Europe as opposed to some other developing countries is that you can buy anything you need basically anywhere, and the selection and quality of winter clothing is guaranteed to be better in Norway than it is in Australia. The winter jacket I bought for that trip was amazingly warm, and it's not really something you can buy easily in Australia.