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Comfort, versatility and value all in one bag! The Sea To Summit Trek Tkll -8°c Sleeping Bag provides traditional comfort at an affordable price, with an anything but traditional design approach. 

The vertical baffles over the chest section ensure the down insulation cannot escape or shift outside of the bag while you're asleep, creating cold spots during the night. A side block baffle construction maintains the 60/40 fill ratio, keeping more down on the top of the bag for maximum insulation. 

Lightweight fabrics reduce weight and packed bulk while the two-way #5 YKK length side zip and seperate foot zip allows the bag to open out completely and double as a quilt. The foot zip is great for extra ventilation or to give your feet extra movement. 

The 3D side-wall baffle ensures that down can loft to the very edge of the bag, maximising insulation, while the panelled hood draws in tight when needed or lies flat for use in warmer weather. The oversized zipper draft tube uses anti-snag materials to prevent the zipper catching, while the soft-touch 20D lining fabric is highly breathable yet also down proof. 

The Trek™ Series sleeping bags are the go-to bag for globe-trotting adventurers on a budget! 


Completing the thoughtful design features of this classic down bag, Sea to Summit have included a large internal security pocket, perfect for keeping valuables. 

  • Tapered rectangular for more space and comfort than a traditional mummy bag
  • RDS 650+ Loft Ultra-Dry Down™ offers excellent insulation and compressibility
  • Lightweight fabrics for reduced weight and bulk
  • Vertical chest baffles prevent down migration and cold spots
  • Two-way #5 YKK side and seperate foot zip allows bag to double as a quilt and provides extra ventilation options
  • Oversized zip draft tube with anti-snag materials 
  • Large internal security pocket
  • 3D side-wall baffle maximises down insulation right to the edge of the bag
  • 3D hood draws in tight when needed
  • Trek Tk3 has additional neck collar draft tube to seal and trap in all your warmth
  • Soft touch 20D lining fabric is lightweight and highly breathable, durable 30D Nylon shell 
  • Includes Ultra-Sil™ Compression Bag for compact storage 
  • Zip Coupling: This bag is designed to pair with many Sea to Summit Women's sleeping bags


 Gender Unisex
Insulation Type Down
Down RDS 90/10 Premium Down
Fabric 30D Nylon shell
Fill Power Ultra-Dry Down™ 650+ Loft
Fill Weight Regular: 500g, Long: 560g
Shape Tapered Rectangle
Temp Rating EN -1 °c Comfort to -8°c Lower
Weight Regular: 980g, Long: 1080g