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Sea to Summit Trek II

Option: Regular Left Zip

The Sea to Summit Trek TkII is a 3 season down sleeping bag designed for versatile comfort in temperatures down to -8°C. With a comfort temperature of -1°C, the Trek TkII is a brilliant balance of weight and warmth.

The Trek series of sleeping bags are no nonsense sacks designed for a wide range of sleeping scenarios in the mountains. Zipped inside the basic, traditional design is a wealth of features that streamline the Trek series to make them some of the most accessible and versatile sleeping bags on the market. The classic, tapered rectangular shape of the Trek sleeping bags afford more space and comfort whilst the vertical baffles over the chest section ensure the down insulation cannot migrate or shift to the outside of the bag during the night; the neck collar draft tube and 3-dimensional hood mean the bag can be synched in tight when the night gets especially chilly.

The Trek bags feature the typical two-way YKK side zipper as well as an additional zip at the foot of the bag which enables it to double as a quilt or simply provide an extra ventilation option for those warmer evenings in the wild. An added bonus of the Trek range is Sea to Summit’s zip coupling technology which allows two bags to be paired together – perfect for couples on an adventure. Topping off the bag’s efficient design is a large internal pocket that’s perfect for storing personal items and keeping things like batteries warm throughout the freezing night.

The Sea to Summit Trek series of sleeping bags are all generously filled with RDS certified 650+ loft ULTRA-DRY down (500g fill Regular) which blends warmth and weight whilst eradicating the negative effects of external and internal moisture on the down filling. Finished with soft touch 20D internal fabric and a 30D nylon exterior shell, the Trek TkII is a robust, packable and fantastically insulated option for a multitude of adventures.


A short video on the Sea to Summit Trek sleeping bag range.

Relevant Article

More Help? For further assistance on choosing your down sleeping bag, we have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: A Guide to Down Sleeping Bags.


  • RDS 650+ Loft ULTRA-DRY Down offers excellent insulation and compressibility
  • Soft touch 20D lining fabric is lightweight and highly breathable, durable 30D Nylon shell
  • Lightweight fabrics for reduced weight and bulk
  • Vertical baffles over the chest section ensure the down insulation cannot migrate or shift to the outside of the bag during sleep, creating cold spots
  • Oversized zip draft tube with anti-snag materials
  • A side block baffle construction maintains the 60/40 fill ratio, keeping more down on the top of the bag for maximum insulation
  • Two-way #5 YKK® side and separate foot zip allows bag to double as a quilt and provides extra ventilation options
  • Shell: 100% Nylon, Lining: 100% Nylon, Primary Filling Material: DUCK DOWN (Min. 85% Down), Stuffsack: 100% Nylon excluding Trims


  • Maximum body size: 183 cm
  • Internal Chest Circumference: 152cm
  • Pack Dimensions: 18x24cm
  • Comfort Temperature: -1 °C
  • Comfort Temperature limit: -8 °C
  • Extreme temperature limit: -25 °C
  • Filling: 500g of ULTRA-DRY treated down
  • Fill power 650+ cuin
  • Weight: 980g

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