Sidney SL 25˚

Women's superlight down fill traditional mummy bags with the REM Pad Sleeve™ that transforms your bag into a Big Agnes System bag

The women's Sidney SL 25 sleeping bag features a first of its kind customizable fit system with exterior hook and loop closures, so you make the call on a comfortable length and width depending on how you sleep or what the temperature is. This bag also features the patent-pending REM Pad Sleeve™; clip the stuff sack to the back of the bag and slide your pad in to ensure you won't roll off during the night.  With soft, technical fabrics, an anti-snag zipper draft tube, and 650 fill power DownTek™ insulation, this bag's versatility is ready to tackle peaks, canyons, and all the roads less traveled. Rest easy, mama.
$237.96 to $254.96 $279.95
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Out of Stock

Specs + Sizing

Bag WeightPetite: 2lb 1oz / 936g / Regular: 2lb 3oz / 992g
Fill WeightPetite: 19oz / 539g / Regular: 21oz / 595g
Compressed Bag SizePetite: 5.5" x 8" / 14 x 20cm / Regular: 6.5" x 8" / 17 x 20cm
Stuff Sack SizePetite: S 7.5" x 15" / S 19 x 38cm / Regular: S 7.5" x 15" / S 19 x 38cm


A pioneer among women's bags, this is the first of its kind to offer a unique exterior cinch system that provides a customizable fit to minimize cold air space and trap more heat closer to the body. 

Traditional mummy shape allows for lightweight and increased thermal value

These bags offer a Big Agnes System option by using the included REM Pad Sleeve™ to secure your bag to the pad. The REM Pad Sleeve™ also doubles as a storage sack.

Vertically structured sidewalls integrating contoured flow baffles trap heat closer to the body

Vaulted foot-box creates more wiggle room for your feet

Contoured hood baffles cradle the head for a more comfortable fit

Oversized interior anti-draft collar 

Unique exterior cinch system allows for a customized fit maximizing warmth and mobility without sacrificing weight and trapping more heat closer to the body

Superlight shell fabric with high-tear strength featuring our own Big Agnes custom print 

Interior zippered stash pocket 

DownTek™ - a water repellent down that uses a PFC-Free, bluesign™ approved chemistry.

Low-profile cordlock lets you un-cinch the hood with one hand

60"/152cm YKK #8 zipper - petite bags

70"/178cm YKK #8 zipper - regular bags

Zipper Garage 

Interior fabric loops for sleeping bag liners

Exterior loops for hang drying or storage

Mate together left and right zip bags

Mesh storage sack & nylon stuff sack

Construction + Materials

Nylon ripstop shell fabric with a water-repellent finish

Nylon Taffeta lining 

Insotect Flow™ construction

650 fill DownTek™ - a water repellent down that uses a PFC-Free, bluesign™ approved chemistry.

Here’s what other people think.

What’s in a Name?

The town of Sidney, located eight miles south of Steamboat, was inhabited by settlers in the early 1880's, before Steamboat existed. Sidney boasted a post office, school, church, blacksmith shop, creamery, and boarding house. With the introduction of the railroad, Sidney became a major shipping hub for agricultural goods. Today, Sidney Peak Ranch is committed to preserving the land's natural character so it will remain for another 125 years to be enjoyed by future generations.