The Brooks Range Drift -10 won our 2017 Editors' Choice award, not because it's the lightest bag, or the most comfortable bag, or even the warmest, but because it scores high metrics in all of these attributes. This bag uses ultralight and durable weather resistant shell fabric, allowing for a roomy cut and loads of down, while still keeping the entire weight of the bag just over 3 lbs. In sleeping bag design, it's all about the warmth-to-weight ratio, and the Drift kills it.
Brooks and Range products are typically only available through their website which has a No-Hassle Guarantee. However, sleeping bags are excluded from this guarantee, along with some other products. Be aware that when you purchase a sleeping bag from them, you will not have the opportunity to send it back if you aren't satisfied.