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
  • 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

4.3
100%
Recommended

6 Reviews

Verified Purchase

Great Bag

[This review was collected as part of a promotion.] I wasn't sure how this bag would work out, but so far it's super. It really is designed as described. It's quite roomy, allows one to turn and side sleep and is definitely warm enough. The best part is that my Standard Manchester Terriers (one or both) can snuggle in as well. That was the whole point of the purchase. They don't fit as well in my other bags but they are fine in this one.

Verified Purchase

Great Features In This Bag

[This review was collected as part of a promotion.] I'm a side sleeper so this for sure caught my attention. I haven't used it out on the trail yet but from testing around the house, it appears to be a great buy. Super comfy, nice and light, feels very warm and just a quality overall product. The only knock from a 5-star review right now is it does feel a bit snug. Wish I had a little more room around the shoulders. I am not a overly big guy, just a little thicker than the average 5'8" male.

Verified Purchase

Comfortable But Not For Colder Temps

[This review was collected as part of a promotion.] The bag was comfortable, but temps got down to 31 degrees and could not stay warm. My sleeping pad is an r value of 7 so I stayed warm underneath but froze on top. They say it’s a snap free zipper but is surely not. Snagged far too many times for me. I returned this bag.

Verified Purchase

Kept Me Nice And Toasty

[This review was collected as part of a promotion.] I finally got out camping this past weekend in the Rocky Mountain National Park. Overnight lows were 32 degrees. I did also use a sleeping bag liner because I was afraid I might be cold. But I was very comfortable all night long. I actually stayed in the tent from 9PM to 9AM.

Verified Purchase

Great Side Sleeper, Wish For A Lighter Version

[This review was collected as part of a promotion.] Comfy, warm, great as a side sleeper, just wish there was a lighter version available. Pretty easy to get in and out of, although the zipper can be a little fussy.

Read All Reviews (6)