Kelty Cosmic Ultra Sleeping Bag

The mummy shape is specifically contoured to be slightly narrower in the shoulders and wider in the hips compared to unisex bags. This reduces dead air space inside the bag, which helps you heat it up faster and stay warmer throughout the night.

The 20-degree rating is generally considered a comfort limit for most sleepers. If you tend to sleep cold, you might want to pair this with a high-R-value sleeping pad to ensure you stay comfortable when temperatures dip near that 20-degree mark.

The 800-fill power down is highly compressible, meaning it packs down into a very small, manageable size for your backpack. It lofts up quickly once you take it out of the stuff sack, providing immediate warmth.

Yes, it includes a stuff sack designed to compress the bag down for backpacking. We recommend storing the bag uncompressed in a larger storage sack or hanging it up at home to maintain the loft of the down over time.

While it is rated for 20 degrees, it can be used in warmer weather if you unzip it partially or use it as a quilt. However, because it is insulated with high-loft down, it may be too warm for mid-summer nights in hot climates.