For summertime mountain backpacking, or spring/fall backpacking in warmer climates, I prefer a mummy style ultralight down sleeping bag rated at around 30 F. Cold nights near or below the bag's rating are not uncommon, and a mummy style bag has certain advantages: there are no drafts, I can easily wear clothes inside to extend the bag's warmth, and I can "mummy up" to seal the warmth inside.
The North Face's Flight Series gear "utilizes the latest technologies and most innovative materials to shave weight and enable the outdoor athlete to go fast and light, while still staying protected by the elements. It's a collection featuring the latest in ultralight, packable, adaptive, and multi-purpose gear." The Flight Series Beeline sleeping bag is their lightest 30 F sleeping bag.
The Beeline is filled with 850+ fill power down, has a 15 denier ripstop shell, and is rated at 30 F. The feature set is spartan, which is typical of an ultralight sleeping bag: down insulated hood with elastic one-handed drawcord, 1/3 length zipper, down-filled draft tube, vaulted footbox with zipped vent, and heat-transfer logos. The only thing unusual is the zippered vent on the footbox, which some hikers will find useful and others won't.
From the description, the Beeline sounds like a top notch ultralight down mummy-style sleeping bag. However, the devil is in the details. Read on...
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