Big Agnes Torchlight EXP

The bag features zippered panels along the sides that you can open or close to adjust the girth. You can add up to 10 inches of width at the shoulders, hips, and feet, allowing you to customize the fit based on your sleeping position or how much room you need to move.

Yes, it is specifically designed for side sleepers. The expandable panels provide the extra width needed to curl up or shift positions comfortably without feeling restricted by the mummy shape.

The Torchlight EXP includes an integrated pad attachment system that secures the bag to your sleeping mat. This prevents you from rolling off the pad or sliding around during the night, keeping you centered and insulated.

The bag is engineered to maintain thermal efficiency even when expanded. While opening the panels increases the internal volume, the high-quality Downtek insulation is designed to keep you warm down to its 0°F rating, provided you are using an appropriately insulated sleeping pad.

The 0°F rating is the lower limit for survival, while the ISO Comfort rating of 18°F is the temperature at which an average sleeper will feel comfortable and warm. For most winter camping, you should plan around the 18°F comfort rating.

At 3.625 lbs, this bag is slightly heavier than a minimalist, non-expandable mummy bag due to the extra fabric and zippers required for the expansion system. However, the trade-off is significantly more comfort and versatility for those who dislike the tight fit of traditional bags.