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Sea to Summit Trek TkI Down Sleeping Bag

SKU# STS_10684/85

The Trek TkI sleeping bag is the perfect compromise between comfortable roomy bags and warm trim fit mummy bags for summer camping and adventure travel. It features a 3 dimensional hood, ULTRA-DRYDown™ 650+ loft responsibly sourced duck down, two zips that allow you to open the bag like a duvet and comes with a compression sack for easy packing.

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  • Tapered rectangular shape offers a good compromise between the comfort of a generous cut shape and the warmth of a closer fit
  • 3D hood
  • 2D PermaShell™ DWR shell fabric
  • Soft touch lining fabric is down proof by construction and highly breathable offering a comfortable sleep
  • 650+ loft power
  • 60 upper / 40 underside fill ratio
  • Differential cut shell with 3D side walls, a feature normally reserved for technical alpine sleeping bags, provides more space for the down to loft right to the edge of the bag
  • Sewn through baffles on the base of the bag
  • Side block baffle
  • Zip draft tube with anti-snag
  • Cushioned internal hood drawcord with dual adjustment for a comfortable seal around your face
  • 2 way YKK #5 zips with separate foot zip - allows you to open the bag into a duvet
  • Large sized internal zip pocket inside the chest area to store valuables like a passport and wallet or electronic devices
  • Includes a lightweight Ultra-Sil® compression bag (volume 10 to 3.3 litres) and a storage cell


Fits to 183cm (Regular), 192cm (Long)
Shoulder Width 76cm (Regular), 81cm (Long)
Foot Width 51cm (Regular), 54cm (Long)
Compression Compressed volume: 5.1 litres
Fill ULTRA-DRYDown™ 650+ Loft 85% Down Cluster Premium Duck Down
Fill Weight 350g (Regular), 400g (Long)
Average Weight 790g (Regular), 880g (Long)
Temperature Rating 0°C Lower comfort level for men
Made From 2D PermaShell, 33D nylon with DWR, 342T high-density down proof weave


2D PermaShell™ Fabric is an extremely breathable, water-repellent 33-denier nylon with a DWR (durable water resistant) finish. This material is highly vapour permeable and down proof by construction therefore it does not rely on coatings that reduce breathability and add weight.

ULTRA-DRYDown™: is a permanent (no loss of treatment effect has been seen in over 14 wash cycles) Nano-level water repellent polymer treatment applied to Sea to Summit high loft, high quality down. The Nano-thin treatment vastly improves the down's reaction to water without effecting its weight or loft performance. ULTRA-DRY Down™ retains over 60% more loft and absorbs 30% less moisture when compared with untreated down. Sea to Summit sleeping bags dry out 60% faster than bags with untreated down.

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