Sea to Summit Trek TkII 18ºF Ultra-Dry Down Sleeping Bag - Discontinued Model

Sea to Summit Trek TkII 18ºF Ultra-Dry Down Sleeping Bag - Discontinued Model

Incorporating Sea to Summit's® 2D PermaShell™ fabric and a premium 650+ Loft ULTRA-DRY Down™, the Trek bags are a refined classic. The 60 / 40 fill ratio in the Trek bags is maintained using a side block baffle and differential cut shell. In the top of the shell a 3D side wall, a feature normally reserved for technical alpine sleeping bags, provides more space for the down to loft right to the edge of the bag.

An oversized security pocket located inside the bag is easily accessible, ideal for stashing passports and other valuables while traveling. The soft touch lining fabric is down proof by construction and highly breathable offering a comfortable sleep.

The tapered rectangular design offers a good compromise between the comfort of a generous cut shape and warmth of a closer fit. A full length side and foot zip allow the Trek series to be opened out into a full duvet for use indoors and warm weather.

  • Tapered rectangular sleeping bag
  • Regular length
  • 2D PermaShell DWR shell fabric
  • Differential cut shell with 3D side walls
  • 60 / 40 fill ratio
  • Side block baffle
  • Zip draft tube with anti-snag, cushioned internal hood drawcord with dual adjustment
  • Two-way YKK #5 zips side zips with separate foot zip
  • Large sized internal zip pocket
  • Left-side zip
  • Lightweight Ultra-Sil® compression bag
  • Mesh storage cell and laundry bag
  • Fill weight: 18 oz.
  • Season rating: Indoor / summer / spring / autumn
  • Compression bag: Small - 10 L to 3.3 L
  • Suggested use: Trekking, travel, hiking, camping

EN rating:

  • Comfort: 30ºF / -1ºC
  • Lower limit: 18ºF / -8ºC
  • Extreme: -13ºF / -25ºC
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Following a successful 1984 climb up the north face of Mount Everest, one of the summiteers, Tim Macartney-Snape decided to return six years later so that he could do what no one else had done - climb it starting from sea level, that is from "sea to summit".

For this trip, in 1990, Tim swam in India's Bay of Bengal and then set off on foot across the Gangetic plain toward the distant Himalayan foothills and four months later, set foot once again on the highest point on earth. Tim's solo ascent of Mt. Everest was named the "Sea to Summit" expedition.

Back in Australia, he joined forces with friend Roland Tyson to build a business that could make use of their knowledge of the outdoors to create truly ingenious, well-made but affordable outdoor equipment. They named their company Sea to Summit® after Tim's expedition and the business prospered. Today the Sea to Summit brand continues to provide innovative gear and serves a growing band of outdoor enthusiasts all over the world.
Description Average weight Fill Comfort rating Price  


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Product Details

Sea to Summit Trek TkII 18ºF Ultra-Dry Down Sleeping Bag - Discontinued Model

SKU #:
UPC #:
Average weight:
2 lbs. 4 oz.
Ultra-Dry Down 650+ loft 85/15 premium duck down
Comfort rating:
18ºF / -8ºC
Fits up to:
6' 0"
Hip girth:
40D soft touch
2D PermaShell: 33D nylon w/ DWR
Shoulder girth:
Stuff sack size:
10 Liters - 3.3 Liters
2 lbs. 4 oz. Ultra-Dry Down 650+ loft 85/15 premium duck down 18ºF / -8ºC $299.00