Winter holidays are fun. Going into the mountains for skiing and fun in the snow is always a thing to look forward to. It is more enjoyable if you manage to arrive in one piece instead of ending up in a ditch. It might also be worth a lot of money as many countries hand out hefty fines if you haven't readied your car for snow and icy conditions on roads and mountain passes.
When you go for long hikes, a rucksack is an essential bit of kit to take along. It is there to take up all the stuff you might need while being on the way for several hours. If you pack it right, it will be a big help and hardly any trouble; if you pack it wrongly, it will be a pain in the neck and possibly dangerous. Packing a rucksack is not rocket science, but taking some care with it helps a long way.