Sea to Summit Trek TkIII Sleeping Bag

-11°C Comfort Limit, 700g of 650+ Fill Power ULTRA-DRY Down (US Method)
Weighs 1255g (Regular bag)
Code: SS14588V
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Sea to Summit's Trek series of sleeping bags offer technical construction and high quality materials in a bag with a roomy shape and generous cut that can be unzipped flat to create a duvet.

Sea to Summit says:

The classic tapered rectangular sleeping bag – redefined!

Incorporating our 2D PermaShell fabric and a premium 650 loft down, the Trek bags are a refined classic. The 60/40 fill ratio in the Trek Tk111 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 travelling. The soft touch lining fabric is down proof by construction and highly breathable offering a comfortable sleep.

The Trek series is our choice for adventure travel and globe-trotting. Whether sleeping in hostels throughout Europe, backpacking South America or discovering the Stirling Ranges in Western Australia.

Tapered rectangular sleeping bags:

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.

Sea to Summit's Trek sleeping bags are designed for people who don't like to be restricted by a close fitting mummy bag, the tapered shape provides more room to move around and the two way zip that goes down the left side and across the foot gives even more flexibility for venting or opening the bag out to form a duvet.

There's no boxing at the foot but the bag is big enough for that not to matter. There's a compromise with regard to warmth, spacious bags are not as warm as close fitting ones because the air moves around a lot more.

The Trek series bags are filled with 650 Fill Power down, which fits with its focus as a more generous bag rather than a highly focused ultralight offering, and with a larger bag you need more down to fill it, so in the TKIII there's 700grams, which is a lot. Its hydrophobic down down as well - which means it'll perform better if the bag gets damp.

If you want a more generous bag but want the improved performance of a technical construction and high quality materials then the Trek series is worth serious consideration.

- Reviewed by Ultralight Outdoor Gear

Help and advice:Choosing a sleeping bag adviceEN 13537 rating for sleeping bags explainedAll about down filling in sleeping bags
Sleeping bag shape and sizes adviceSleeping Bag features Page 1Sleepin bag features page 2
  • Tapered rectangular
  • 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
  • 2 way YKK #5 zips with separate foot zip
  • Large sized internal zip pocket
  • Includes lightweight Ultra-Sil compression bag
  • Mesh storage cell and laundry bag
  • EN 13537 Rating Comfort -5C, Comfort Limit -11C, Extreme -30C
  • Season Ratings: Spring/Autumn/Winter-light
  • Down: Ultra-Dry Down, 650+ Loft, 85% Down cluster, premium Duck Down
  • Fill weight: Regular 700g | Long 750g
  • Bag weight: Regular 1255g | Long 1340g
  • Length / zip options: Regular – left zip | Long – left zip
  • Suggested use: Trekking, Travel, Hiking, Camping
  • Compression bag: Medium – 15 to 5 litres
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