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Sea to Summit - Alpine III Sleeping Bag

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Sea to Summit - Alpine III Sleeping Bag

Availability: In stock

Stock #: 274P-

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Filled with the highest quality 850+ Loft RDS-certified ULTRA-DRY Goose Down™, protected by 3D NanoShell%trade; windproof and water-resistant fabric, the Alpine series is your cocoon in high altitude and arctic conditions.

Designed with a contoured mummy fit and anatomical shaped foot box, warmth is trapped close to the body without a claustrophobic feel. With an oversized neck collar and hood seal, drafts are kept out, minimizing heat loss around the face. A security pocket located inside the bag is easily accessible, ideal for stowing electronics to preserve battery performance in extreme cold. Using a side block baffle construction to maintain a 60/40 fill ratio means that more down is located in the top of the bag for maximum insulation.


  • Thermally efficient mummy shape
  • 3D NanoShell™ fabric – unique technology which prevents internal condensation from migrating back into the down.
  • Differential cut shell with 3D side walls
  • Offset baffles
  • 60/40 top/bottom fill ratio
  • Side block baffle
  • Anatomically tapered foot
  • Zipper draft tube with Dacron anti-snag strip
  • Neck draft tube with dual elastic adjustment
  • Cushioned internal hood drawcord with dual adjustment
  • 2 way YKK® #5 zipper
  • Medium sized internal zipper pocket
  • Includes lightweight Ultra-Sil® compression bag, mesh storage cell and laundry bag.

Additional Information

Material Shell: 3D NanoShellâ„¢ 20D high density polyester ripstop weave with DWR
Lining: 20D polyester, soft touch
Insulation 850+ fill ULTRA-DRY™ goose down
Temp Rating EN Comfort: 10 F / -12 C
EN Lower Limit: -4 F / -20 C
EN Extreme: -44 F / -42 C
Length Regular fits up to 6' 0"
Long fits up to 6' 7"
Shoulder Girth Regular: 60" / 154 cm
Long: 64" / 162 cm
Hip Girth Regular: 51" / 130 cm
Long: 53" / 136 cm
Foot Girth Regular: 40" / 103 cm
Long: 41" / 106 cm
Packed Size 12.3 Liters
Weight Regular: 3lb 9oz / 1610g
Long 3lb 14oz / 1745g
Zipper Type YKK #5 reverse zip
Stuff Sack Sea to Summit Ultra-Sil® compression sack

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