With its classic mummy cut, weather-resistant treated down insulation, and weight well under 3 pounds, the Sierra Designs Nitro UL 800 0 Degree sleeping bag is a lightweight, packable option for cold-weather 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 0 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: 2 lb, 8 oz
Long: 2 lb, 12 oz
Other Stuff Sack and Storage Sack Included Warranty Limited Lifetime Packed Size 16" x 9" 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 0 Degrees F EN Comfort Rating 15 Degrees F EN Lower Limit Rating 2 Degrees F
Real Customer Reviews
- Loved everything but the short length of the side zipper
Likes: I really, really loved this bag. But I didn't keep it because the zipper was too short, making it more of a struggle to get in and out. The fit, feel, loft, warmth, weight, pack size, appearance, quality -- all great IMO. A favorite feature was the foot vent, because it was very easy to slide one's feet in and out to regulate temp, or (if you are like me) relieve foot cramps that are exacerbated when anything rests on my toes. It did not seem to let cold air in the bag, as I thought it might. If a shorter zipper works for you, this bag is a good one.
Dislikes: Zipper stopped too far away from the feet
- Great Bag
Likes: I have never been a fan of mummy bags but after some cold night with my old Big Agnes bag that is rectangular I realized I needed something warmer. I didn't want to feel claustrophobic though and heard that these Sierra Designs bags were a little more roomy. It definitely is and the foot slot is great if things get a little too toasty on warmer nights. The quality of the bag is great and I have been happy so far.
Dislikes: Wish it had an integrated pad sleeve. That is still a favorite feature from my old Big Agnes. A pillow sleeve would be nice as well.
- WARM WARM WARM
Likes: Warm lightweight best down sleeping bag I’ve ever had
Dislikes: None so far
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