Marmot Hydrogen 30 Degree Down
I bought this sleeping bag because I needed the lightest bag I could find with the most warmth to pack in my 25 liter motorcycle backpack. It's tiny when packed, leaving room for lots of other necessities. We've camped in -2 to -4 degree (centigrade) weather so far this year and I can say that this bag did the business every time. While a little more expensive, it's terrific bag for the money if you're after the lightest, warmest bag around.