Kelty Cosmic Ultra

With a temperature rating of 20°F, this bag is designed for three-season use. While it works well for cool spring or autumn nights, it is not intended for deep winter conditions where temperatures consistently drop below freezing.

The 800-fill DriDown is treated to resist moisture, meaning it retains its loft and warmth better than untreated down if it gets slightly damp. However, it is still down, so you should take care to keep it dry inside your pack.

The Cosmic Ultra features a spacious, trapezoidal footbox that allows your feet to rest in a natural position, which helps reduce that cramped feeling common in traditional mummy bags. While it is still a performance-fit mummy bag, the design prioritizes comfort alongside thermal efficiency.

Kelty specifically engineered this bag with an anti-snag zipper design to prevent the fabric from catching. It is built to be reliable and smooth, making it easy to get in and out of the bag quickly in the middle of the night.

Weighing in at 2.35 lbs, this bag strikes a solid balance between weight and warmth. It is light enough for most backpacking trips without sacrificing the loft needed for a comfortable night's sleep.