How to Choose Sleeping Bags for Backpacking
Anacortes
Big Agnes Sidewinder SL 20 Sleeping Bag
$186.73Compared to $249.95*Save 25%
Sleep on your side—comfortably. This Bag Agnes sleeping bag is designed for those who sleep on their sides. It's contoured to ensure warmth, comfort and ease of use in any position you settle into.
Key Details
Fill
650-fill-power Downtek™ PFC-free down and FireLine™ Eco 100% post-consumer recycled polyester
Weight
Regular: 2 lbs. 4 oz.
Compressed Volume
Regular: 4.35 liters
Temperature Rating (F)
20 degrees (F)
- The Sidewinder SL is a side sleeper's dream bag with technical features that roll seamlessly from one adventure to the next—and from one side to the other at night
- Specifically designed for people who sleep on their sides; technical fit is patterned to move with you as you roll from one side to the other
- Engineered and ergonomically contoured to ensure warmth, comfort and ease of use in any position you settle into
- Body-mapped insulation optimizes warmth where you need it and minimizes pressure points and other "side effects"
- Down fill with a PFAS-free water-repellent finish throughout the bag provides lofty warmth; synthetic insulation helps alleviate common pressure points in the hips and feet
- FireLine™ ECO synthetic insulation features low-denier fibers that are tightly woven and provide high loft, compressibility, high weight-to-warmth ratio, and durability
- Optimized fit and thermally efficient footbox is patterned to mimic the shape of your foot position while lying on your side
- Improved shell fabric and lining with PFAS-free water-repellent finish
- Close fitting, jacket-style hood keeps insulation close to the body without sacrificing mobility
- Easily adjust hood without unzipping using low-profile internal cordlock access
- Keep your pillow in place with the unique Pillow Barn; it's made of stretch-mesh material with interior access from either side for easy adjustment (pillow not included)
- Smooth, quick zip with antisnag locking zipper with no-draft zipper garage and long, ambidextrous zipper
- Seal out drafts by cinching insulated tube along upper hood opening
- Hang dry or store bag with exterior loops
- Storage sack and stuff sack included
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Big Agnes Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 19 degrees (F) - ISO |
| Tested Comfort | 30 degrees (F) - ISO |
| Temperature Rating (F) | 20 degrees (F) |
| Temperature Rating (C) | -7 degrees (C) |
| Weight | Regular: 2 lbs. 4 oz. |
| Shell | Nylon ripstop featuring a PFAS-free water-repellent finish |
| Zipper Location | Front |
| Insulation Type | Down / Synthetic Blend |
| Water-Resistant Down | Yes |
| Fill | 650-fill-power Downtek™ PFC-free down and FireLine™ Eco 100% post-consumer recycled polyester |
| Fill Weight | Regular: 1 lb. 3 oz. |
| Sleeping Capacity | 1-person |
| Lining | Post-consumer recycled polyester taffeta featuring a PFAS-free water-repellent finish |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Regular: 72 inches |
| Shoulder Girth (in.) | Regular: 61 inches |
| Hip Girth (in.) | Regular: 55 inches |
| Stuff Sack Size | 8 x 17.5 inches |
| Stuff Sack Volume | 14 liters |
| Compressed Volume | Regular: 4.35 liters |
| Gender | Unisex |
Write a Review
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Location:Arizona
Age:55–64
1 week ago
Warm, haven't figured out arm holes yet
Yes , I recommend this product
So I have slept in this for 3 nights on one trip so far. The center zipper is more convenient than a standard one-side only zipper, but I still find myself rotating inside the bag so that it is not permanently stomach centered. That is my issue as I can't wear with the hood as I need to stick my arm out to the side due to shoulder issues. I can't exactly figure out how to use the arm hole pocket feature yet. Regardless, this bag was definitely warmer than my old bag that was similarly rated. Will likely open up the zipper a bit near the feet next time. I like that it comes with both a loose storage bag AND a small compressed bag.
Age:55–64
