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Big Agnes Sidewinder SL 20 Sleeping Bag

About This Item

Temp Rating

15 to 30 Degrees

Insulation Type

Down

long SPECS:

  • Bag weight: 2 lb. 8 oz. / 1.13 kg
  • Fill weight: 21 oz. / 604 g
  • Compressed bag size: 7.5 x 8 in. / 19 x 20 cm
  • Stuff sack size: 8 x 17.5 in. / 20 x 45 cm
  • Sleeve (in.): Top: 65 / Middle: 59 / Bottom: 40
  • Bag size: Fits up to 6 ft. 6 in. / 198 cm
  • Works with any pad size or style
  • Shell: nylon ripstop featuring a PFC-free water repellent finish
  • Lining: polyester taffeta featuring a PFC-free water repellent finish

regular SPECS:

  • Weight: 2 lbs. 4 oz.
  • Fill Weight: 19 oz.
  • Fits: persons up to 6 ft. tall
  • Compressed Bag Dimensions: 6.5 in. x 8 in.
  • Stuffsac Dimensions: 8 in. x 17.5 in.
  • Temperature Rating: 20°F

STORAGE:

  • Hang dry or store bags with exterior loops
  • Storage sack and stuff sack included

DESIGN AND DETAILS:

  • Traditional mummy bag designed for side sleepers
  • Patterned to move with you as you roll from one side to the other
  • Close fitting, jacket-style hood keeps insulation close to the body without sacrificing mobility
  • Keep pillow in place with unique Pillow Barn made of stretch mesh material with interior access from either side for easy adjustment
  • Optimized warmth and minimized pressure points with body mapped insulation
  • Primary Fill: 650 fill DownTek™ repels water while maintaining insulating value – bluesign® Certified PFC free water repellent chemistry
  • Body Mapped Fill: FireLine™ ECO Synthetic Insulation, 100% post-consumer recycled polyester, featuring 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
  • Smooth, quick zip with anti-snag locking zipper with no-draft zipper garage, and long, ambidextrous zipper
  • Easily adjust hood without unzipping using low-profile internal cordlock access
  • Seal out drafts by cinching insulated tube along upper hood opening
  • Brand : Big Agnes
  • Country of Origin : Imported
  • Web ID: 21TUMMSDWNDRSL20LCSL
Sleeping Bag SizeRegular Long
ShapeMummyMummy
Minimum Trail Weight2 lb. 4 oz.2 lb. 8 oz.
Temp Rating 20° F20° F
Fill Weight1 lb. 3 oz. 1 lb. 5 oz.
Insulation TypeDown/Synthetic BlendDown/Synthetic Blend
Fill Power650 DownTek/FireLine ECO650 DownTek/FireLine ECO
Shoulder Girth61 in. 65 in.
Hip Girth55 in.59 in.
Fits up to72 in.78 in.
Compressed Volume4.35L 5.8L
Shell FabricRipstop NylonRipstop Nylon
Zipper LocationFrontFront
Stuff Sack Included YesYes
Stuff Sack Size 8 x 17.5 in8 x 17.5 in

REVIEWS

4.5
100%
Recommended

25 Reviews

Very Warm And Comfortable

This bag is really warm. On my last trip, temps got into the low 40's and I slept with it unzipped down to my waist. I've used it down to about 28 degrees and been toasty. The pillow pocket is handy and my pillow seems to stay under my head even when I switch sides. My only complaints are that it leaks down and the zipper snags if I'm not careful. I'll have to see if the down issue persists after washing it.

Nice, Comfortable, And Warm Sleeping Bag

This is a warm and comfortable sleeping bag. I sleep on my side, and I love that this is designed for that. It is worth mentioning that this sleeping bag is quite big when packed into its stuff sack, but it still compresses a bit when it's in a backpack or pannier.

Really Nice For Side Sleepers

I own the 2022 version. This is a good overall bag that has the added convenience of being designed for side sleepers. The main advantage of this design, in my opinion, is that you can toss and turn from side to side and the zipper is always accessible. It packs pretty small. I put it in my 14L Revelate Terrapin seat bag and can still fit a couple dinners, my Nanopuff, snacks, toiletries, and a few odds and ends. I've haven't had to push the temp limits of the bag, but it's been warm enough for me in high 30s weather. (I sleep cold and wear my medium weight wool base layers.) The Sidewinder does leak down more than any other down bag I've owned. But I think this is mostly annoying (down feathers in the tent) and hasn't significantly compromised the warmth of the bag.

Yes

The zipper did break right away but was repaired for a cost

Great Bag!

I have always been a side-sleeper and really appreciate the attention to detail with this product. I just used it on a 2 night/3 day trek. On the last morning, I woke to snow and frost on my tent fly. Yet, I was warm and comfy. This is a great product.

Read All Reviews (25)