Big Agnes Greystone Sleeping Bag

No, this bag is designed for three-season use with a temperature rating of 30 degrees Fahrenheit. It will keep you comfortable during spring, summer, and fall, but it is not insulated enough for freezing winter temperatures.

The bag uses 600-Fill DownTek, which is treated to resist moisture. While it maintains loft better than untreated down in damp conditions, it is still a down bag, so you should avoid fully submerging it or using it in torrential rain without a tent or bivy.

The mummy shape is designed to minimize dead air space around your body, which allows your natural heat to warm the bag more efficiently. This design also significantly reduces the overall weight and packed size of the bag compared to rectangular options.

Yes, the Greystone is designed to be compatible with other Big Agnes bags, allowing you to zip them together for shared warmth. This is a great feature for couples or those who prefer a bit more room while sleeping.

Absolutely. The integrated draft collar acts as a seal around your neck and shoulders, preventing warm air from escaping and cold air from creeping inside when you move. It is a key feature for maintaining consistent warmth throughout the night.