All good but....
Recently I bought a Marmot Atom and I was highly impressed by its weight and excellent design. However, when I tested this out camping in Northern Chile for a week with temperatures of between 5 and 10 C (40 and 50 F) I had an unpleasant discovery: this bag is nowhere near capabale of its supposed minimum. Even with my entire stock of warm clothing on I just managed it keep warm. Basically it seems the reason Marmot was able to make this bag so light is that they didnt put any down in it. My advice: this is a good bag but buy one that has a much lower rating than your needs