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Sea To SummitSpark SpII Sleeping Bag: 28F Down

Sea To SummitSpark SpII Sleeping Bag: 28F Down

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5 out of 5 stars
1 Review

Why We Like The Spark SpII 28 Down Sleeping Bag

Ultralight and highly compressible, the Sea to Summit Spark SpII Sleeping Bag is one of our favorite recommendations for backpackers, racers, cyclists, and alpine climbers in search of a minimalist yet comfy night's sleep outside of doors.

Intent on making the lightest bag out there, Sea to Summit stuffed the Spark with 850-fill down for the best possible warmth-to-weight ratio. We love that this bag's nylon shell is windproof and prevents the down from breaking through, as well as the smooth nylon lining adding some durability. Going beyond an ultralight design, Sea to Summit added its Ultra-Dry Down treatment to help this bag resist moisture and enhance your comfort regardless of the conditions.


  • Lightweight and compressible sleeping bag for alpine adventures
  • Contoured mummy shape is roomy yet maintains thermal efficiency
  • Ultra-Dry Down resists moisture for warm sleep in wet conditions
  • Lightweight nylon shell is highly compressible for easy packing
  • Vertical baffles in torso area boost warmth around your core
  • Horizontal baffles in lower body area minimizes the bag's weight
  • Draft tube prevents heat from escaping through the side zipper
  • Half-zip, 2-way zipper allows quick ventilation on warmer nights
  • Item #STS006Z

Tech Specs

[face fabric] 10D nylon, [lining] 7D nylon
RDS 850+ Loft Premium Goose Ultra-Dry Down
contoured mummy
Max User Height
[regular] 6ft, [long] 6ft 4in
Shoulder Circumference
[regular] 59in, [long] 62in
Hip Circumference
[regular] 51in, [long] 54in
Foot Circumference
[regular] 35in, [long] 58in
Bag Length
[regular] 6ft, [long] 6ft 4in
Draft Tube
Pad Retainer
two-way zipper
Fill Weight
[regular] 10.6oz, [long] 12.2oz
European Norm/ISO Comfort Rating
European Norm/ISO Lower Limit Rating
Storage Sack
storage cell
Stuff Sack
Ultra-Sil compression bag
Stuff Size
[regular] 11 x 5in
Claimed Weight
[regular] 1lb 1.3oz, [long] 1lb 3.8oz
backpacking, mountaineering
Manufacturer Warranty

Overall Rating

5 based on 1 ratings

Review Summary

5 Stars - 1 reviews
4 Stars - 0 reviews
3 Stars - 0 reviews
2 Stars - 0 reviews
1 Stars - 0 reviews

Fits Small

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