The temptation with the jacket is to get the warmest you can. If you are going through winter in northern Wisconsin as I did while testing these things, it was not a bad idea. But if you are just looking for a little warmer on the shoulder trips, or even a high summer backpack, you do not need a power to fill 800, the winter is too big.
We offer to stick with the coats Ranking energy filled down At least 500 for lighting, but there is no reason to spend a jacket with 900 times, unless you will go out below the freezing level (or you are a one colder). If you mostly spend time in the less extreme climatic climates, take a lighter jacket.
Also, remember that, in the case of a backpack, you will want to remember the level of packaging of a coat and its weight increased as much as your package. Unfortunately, the lightest coats tend to be higher energy, because you can trap more warmer with less, but again, realize the temperature you will stay and you have Can escape a cheaper coat.