Demo Sidney SL 25 Regular, Right Zip

Big Agnes

  • $149.97
  • Save $149

*Patched with repaired seam*


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.


  • Exterior cinch and hook-and-loop closures let you decide the length and width based on temperature or how you sleep, maximizing warmth and mobility without sacrificing weight
  • DownTek insulation absorbs 30% less water and dries 60% faster than untreated down, and retains significantly more loft than untreated down after exposure to moisture
  • Included REM Pad Sleeve™ secures your bag to the pad so you don't roll off the pad at night; REM pad sleeve detaches and doubles as a storage sack
  • Thermally efficient vertical structured sidewalls trap heat close to your body while the contoured shape of the hood cradles your head in lofty comfort
  • Traditional mummy shape allows for light weight and increased thermal value
  • Superlight, soft-shell fabric with high tear strength and Insotect Flow construction
  • Interior zippered stash pocket
  • Vaulted footbox creates more wiggle room for your feet
  • Contoured hood baffles cradle your head for a comfortable fit
  • Low-profile cordlock lets you un-cinch the hood with only one hand
  • Oversized interior anti-draft collar
  • 70 in. (178cm) YKK #8 antisnag zipper with zipper garage
  • Interior fabric loops for sleeping bag liners; exterior loops for hang drying or storage
  • Includes a mesh storage sack and nylon stuff sack
  • Mate together left and right zip bags
  • Pad not included

Technical specs

Best Use
Tested Lower Limit
10 degrees (F) - EN
Tested Comfort
22 degrees (F) - EN
Temperature Rating (F)
Temperature Rating (C)
Regular - Right Zip: 2 lbs. 3 oz.
Short - Right Zip: 2 lbs. 1 oz.
Ripstop nylon
Zipper Location
Insulation Type
Water-Resistant Down
650-fill-power DownTek down
Fill Weight
Regular - Right Zip: 21 ounces
Short - Right Zip: 19 ounces
Nylon taffeta
Sleeping Bag Shape
Fits Up To (in.)
Regular - Right Zip: 70 inches
Short - Right Zip: 65 inches
Shoulder Girth (in.)
Regular - Right Zip: 55 inches
Short - Right Zip: 53 inches
Hip Girth (in.)
Regular - Right Zip: 56 inches
Short - Right Zip: 54 inches
Stuff Sack Size
7.5 x 15 inches
Stuff Sack Volume
11 liters
Compressed Volume
Regular - Right Zip: 4.35 liters
Short - Right Zip: 3.11 liters