Women's 3 Season Sleeping Bag vs Therm-a-Rest Boost 650 Sleeping Bag

The Therm-a-Rest Boost 650 is the more versatile bag: the WarmZip center zipper converts it between semi-rectangular and mummy shapes and adds warmth, and the arm holes let you read or ventilate without getting out. It uses 650-fill hydrophobic down with zoned insulation and comes in Short, Regular and Long, each with a Wide option. The women's 3 Season bag is lighter (about 893 g vs 1021 g) and uses higher-fill 750+ down, but it fits only to 5 ft 7 in and its listed specs conflict on temperature. Buyers rate the Boost 650 highly and call it roomy and good for side sleepers, though a few report the zipper catching and stray feathers.

• Choose the women's 3 Season bag if you are a smaller backpacker who wants a lighter load, a women's-specific cut and high-fill down, and you sleep warm enough for a 30°F comfort rating.
• Choose the Therm-a-Rest Boost 650 if you want one bag that shifts between roomy and mummy shapes, has arm holes and a wide size option, and is backed by strong owner ratings.