With its classic mummy cut, weather-resistant treated down insulation, and weight of less than 2 pounds, the Sierra Designs Nitro UL 800 20 Degree sleeping bag is a lightweight, packable option for 3-season backpacking.
Renowned for their efficiency in retaining heat and compressible properties, the feathers and fibers of duck down have an incredibly soft, comfortable feel and, despite advances in synthetic materials, continue to provide the best warmth-to-weight ratio of any insulation available. The one inherent weakness of down insulation is that it loses much of its ability to maintain warmth when it gets wet, but the bag’s 800-fill fluro-carbon-free DriDown performs differently. Employing a unique, innovative polymer application, DriDown actually creates a hydrophobic finish on each individual plume of down. This treatment results in insulation that stays dry longer and dries faster, should it become wet, than untreated down. Perhaps most impressively, this allows the insulation to retain 98% of its loft which translates into maintained warmth that untreated down bags simply cannot achieve. A 15D nylon ripstop shell further protects the bag’s interior while keeping weight to a minimum.
The bag’s mummy cut increases thermal efficiency by eliminating potential dead spots. It also helps to keep weight to a minimum. A draft collar aids in keeping cold air out of the interior of the bag. An ergonomic hood helps reduce heat loss by keeping your head warm and comfortable. Insulated, baffled sidewalls keep insulation from shifting and give the bag depth to maximize the feeling of livability while retaining warmth. A unique self-sealing foot vent allows you to extend your feet out of the bottom of the bag in balmy weather but effectively retains heat when temperatures require it.
The Sierra Designs Nitro UL 800 20 Degree sleeping bag is available in Regular (fits up to 6' 0") and Long (fits up to 6' 6") lengths. A stuff sack and storage sack are included.
California residents: view proposition 65 WARNING
- FC Free 800FP Dridown and 15D nylon fabrics / ultralight weight
- Patented Self Sealing Foot Vent / Fast and Easy Ventilation
- Draft-dodger collar / Helps prevent drafts
- 5" baffle spacing and side wall baffles / Help to keep down from shifting keeping you warmer
- Anti-snag zipper tracks / Makes getting in and out easy
Best Use Backpacking, Camping Insulation Type Down Item Weight Regular: 1 lb, 12 oz
Long: 1 lb, 15 oz
Other Stuff Sack and Storage Sack Included Warranty Limited Lifetime Packed Size 15" x 7.5" Shell Material 15D Nylon Ripstop w/ DWR Liner Material 15D Nylon Ripstop Fits to Length Regular: 6' 0"
Long: 6' 6"
Fits to Girth Regular: 62"
Fill Material 800-Fill DriDown Temperature Rating 20 Degrees F EN Comfort Rating 28 Degrees F EN Lower Limit Rating 17 Degrees F
Real Customer Reviews
- A lot to love
Likes: This bag was a favorite in a side by side comparison of Big Agnes, North Face, and Marmot. Great quality, comfort and features. Nice and warm, super light and packable, and the foot vent was terrific (not cold!).
Dislikes: The shorter length of the zipper was the ONE thing about this bag that we did not like (preferring a zipper that reaches closer to the feet than hip). We are apparently getting too old for any added difficulties getting in/out of our sleeping bags, lol.
- Fantastic bag.
True to temp rating
Great draft collar
Dislikes: Nothing substantial
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