Big Agnes Sidewinder 20 Regular

Sidewinder 20 Regular

by Big Agnes
Current Price
$329.95
0.00% (24h)
All-Time High
N/A
All-Time Low
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Available At
1 Store

Product Description

Traditional mummy bag optimized for side sleepers. Specifically designed for the over 60% of people who sleep on their sides, the second generation of the patented Sidewinder side sleeper technology ensures warmth, comfort, and ease of use in any position you settle into. Constructed for comfort, with additional body mapped insulation to optimize warmth where you need it and provide cushioning and support at the hips and shoulders, easing pressure points and other ‘side effects’. The Sidewinder 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. Optimized profile and thermally efficient footbox is patterned to mimic body position while lying on your side.

  • Down fill with a water-repellent finish throughout the bag provides lofty warmth
  • Strategically placed synthetic insulation to provide padding and pressure relief at the knees, hips, and shoulders
  • 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
  • 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
  • Storage sack & stuff sack included
  • Total Weight: 2 lb 7 oz
  • ISO Comfort: 30°F
  • ISO Limit: 19°F
  • Total Fill Weight: 15oz Down + 6.5oz Synthetic
  • Compressed Bag Size: 10" x 8"
  • Stuff Sack Size: 14L 8" x 17.5"
  • Max User Height: 6'
  • Recommended Pad Size: Works with any pad size or style
  • Shoulder Girth: 61"
  • Hip Girth: 55"
  • Foot Girth: 36"
  • Shell: Recycled polyester ripstop featuring a water-repellent finish without intentionally added PFAS chemicals
  • Lining: Recycled polyester taffeta featuring a water-repellent finish without intentionally added PFAS
  • Primary Fill: 650 fill Downtek™ PFC-Free repels water while maintaining insulating value, with bluesign® Certified 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
  • Machine wash in a washing machine WITHOUT AN AGITATOR, agitators are likely to cause damage to your gear
  • U.S. Patent 11957260 B2

 

Availability & Sizing

Stock Status
In Stock at 1 store
Available Sizes (1)
Available Colors (1)
1 total variants — 1 in stock

Price History

Average Price
High
Low

Historical Data

Last 1 days of price history

May 8, 2026
1 vendors
Low
$329.95
Avg
$329.95
High
$329.95
Showing 1 of 1 days

Price Statistics

Current Price
$329.95
Average Price (90d)
$329.95
Price Range
$329.95 - $329.95
All-Time HighATH
N/A
All-Time LowATL
N/A
24h Change
0.00%(N/A)
7d Change
0.00%(N/A)
Available At
1 Stores
Last Updated
May 8, 2026

Description

Traditional mummy bag optimized for side sleepers. Specifically designed for the over 60% of people who sleep on their sides, the second generation of the patented Sidewinder side sleeper technology ensures warmth, comfort, and ease of use in any position you settle into. Constructed for comfort, with additional body mapped insulation to optimize warmth where you need it and provide cushioning and support at the hips and shoulders, easing pressure points and other ‘side effects’. The Sidewinder 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. Optimized profile and thermally efficient footbox is patterned to mimic body position while lying on your side. Down fill with a water-repellent finish throughout the bag provides lofty warmth Strategically placed synthetic insulation to provide padding and pressure relief at the knees, hips, and shoulders 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 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 Storage sack & stuff sack included Total Weight: 2 lb 7 oz ISO Comfort: 30°F ISO Limit: 19°F Total Fill Weight: 15oz Down + 6.5oz Synthetic Compressed Bag Size: 10" x 8" Stuff Sack Size: 14L 8" x 17.5" Max User Height: 6' Recommended Pad Size: Works with any pad size or style Shoulder Girth: 61" Hip Girth: 55" Foot Girth: 36" Shell: Recycled polyester ripstop featuring a water-repellent finish without intentionally added PFAS chemicals Lining: Recycled polyester taffeta featuring a water-repellent finish without intentionally added PFAS Primary Fill: 650 fill Downtek™ PFC-Free repels water while maintaining insulating value, with bluesign® Certified 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 Machine wash in a washing machine WITHOUT AN AGITATOR, agitators are likely to cause damage to your gear U.S. Patent 11957260 B2

Additional Info

CategoryDdbk01
CurrencyUSD
Product IDcbaee64f...

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Sports Basement
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Available Sizes & Variants (1)

Size:
Color:
VariantSizeColorPriceStatusStoresBuy
Chinois Green/Mercury/Primrose / Regular
RegularChinois Green/Mercury/Primrose
$329.95
In Stock1 storeBuy
Showing 1 of 1 variants