A three-season down sleeping bag is a core item for ultralight backpacking because it offers the best combination of warmth, light weight, and seasonal versatility. I prefer a mummy style bag rated at around 30 F for mountain backpacking. The mummy design eliminates drafts, I can wear extra clothes inside and "mummy up" to extend the bag's warmth on cold nights, and I can open it up and use it as a quilt on warm nights.

The popular Mountain Hardwear Phantom 32 sleeping bag (with a temperature rating of 32 F) has been around a few years. Its main features are 15 denier (0.85 oz/yd2) shell fabric with DWR, 800 fill power down, a full length side zipper, and a six chamber sculptured hood.

It has received a few refinements along the way, and Mountain Hardwear deserves kudos for keeping the upgrades nearly weight neutral. The original Phantom 32 had a 2/3-length side zipper and weight of 22.7 ounces, while the current bag has a full side zipper and weighs 23.1 ounces. Weight saving refinements throughout the bag nearly offset the added weight of a longer zipper.

The Phantom's lightweight shell fabric has a very soft hand, and its taffeta lining is very durable. The #5CN YKK zipper auto locks, so it doesn't open when you expand the bag, and it operates from outside or inside the bag.


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