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Sea to Summit Trek TKII Down Sleeping Bag (-8C)

Sea to Summit Trek TKII Down Sleeping Bag (-8C)
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The Trek™ down sleeping bag brings the comfort of a tapered-rectangular mummy shape and the versatility of a dual-zip ventilation system to wherever your travels may take you. The full-length side zipper and secondary foot box zipper allow you to increase ventilation or open the Trek completely flat like a comforter, and the quality down will keep you warm and snug on chilly nights.

The broader mummy cut gives you room to move inside the bag, regardless of the sleeping position you may adopt. A Regular Wide model is available for those who really appreciate extra girth.

Light and compact, the Trek might just become your favorite trekking / backpacking / travel / camping down sleeping bag.

Weight : 980g / 2.16lbs
Fill : 650+ FP Ultra Dry RDS Down
Fill Weight: 700g / 24.7oz
Compressed Volume: 8.4L

  • ULTRA-DRY Down 650+ Loft 85% Down Cluster Premium Duck Down certified Responsible Down Standard (RDS)
  • Full-length YKK® #5 main side zip and foot box zip provide superior ventilation and allow the bag to be used as a comforter.
  • Shaped hood and oversized zipper draft tubes (Trek 10°F also has a draft collar, fits snugly around shoulders) to seal in warmth and keep cold out.
  • Internal pocket for phone / GPS / valuables
  • Includes lightweight Ultra-Sil™ compression bag and storage cell

Recommended Use

Camping, Hiking, Backpacking


3 Seasons

Temperature Rating


Comfort Limit


Lower Limit



Relaxed Mummy

Insulation Type

650+ Fill Power Ultra Dry


RDS Goose Down

Bag Weight

Regular: 980g / 2.16lbs


Reg Wide: 1160g/2.56lbs


Long: 1080g / 2.38lbs

Fill Weight

Regular: 500g / 17.6oz


Reg Wide: 600g / 21.2oz


Long: 560g / 19.8oz

Fits to User Height

Regular: 183cm / 6ft


Reg Wide:


Long: 192cm / 6’4”

Girth – Shoulder

Regular: 152cm / 60”


Reg Wide: 172cm / 68”


Long: 162cm / 64”

Girth - Hip

Regular: 146cm / 57”


Reg Wide: 161cm. 63”


Long: 157cm / 62”

Girth - Foot

Regular: 102cm / 40”


Reg Wide: 122cm / 48”


Long: 108cm / 43”

Compressed Volume

Regular – 6.1L


Reg Wide: 7.4L


Long – 7.3L

Zipper Options

Full Length - Left Side only

Fabric – Shell

30D Nylon Shell

Fabric – Lining


Comes With

Ultra-Sil Compression Sack


Storage Cell


Sea to Summit Trek Sleeping Bag Series