Sea To Summit
Spark SpI Sleeping Bag: 40F Down

Out of Stock

Don't worry though, we have a lot more Down Sleeping Bags in stock than that.

Spark SpI Sleeping Bag: 40 Degree Down

Weighing only 12 ounces, the Sea to Summit Spark Spl Sleeping Bag brings the comfort without the weight whether you're an ultralight backpacker, an adventure racer, a touring bicycler, or an alpine climber. Primarily focusing on giving you the lightest bag out there, Sea to Summit stuffed the Spark Spl with 850+ down for the best possible warmth-to-weight ratio that can still keep you nice and toasty in temps down to 45F. Going beyond just being ultralight, Sea to Summit's Ultra-Dry Down treatment also helps this bag resist moisture to enhance your comfort regardless of the conditions.

The Spark Spl has a contoured mummy shape to closely fit your body while you sleep. Its full hood wraps around your head to eliminate the possibility of waking up with freezing ears, and the 1/2-length zipper on the left helps maximize warmth when the temps drop. If you find yourself in colder conditions, the SpI can be utilized as an ultralight sleeping bag liner in another sleeping bag to keep you warmer through high alpine treks or winter camping. Finally, the Spark compresses small so you're able to stuff your pack with a few extras even if you are a minimalist.

Details

Versatile, compact, and lightweight performance sleeping bag
Contoured mummy shape delivers comfort and efficient insulation
Warm Ultra-Dry Down insulates even when you're in wet conditions
Light shell fabric compresses down small for efficient packing
Vertical chest baffles prevent down migration to warm your core
1/2-lengh zipper allows easy access while keeping weight down
Lightweight design allows use as a liner in colder conditions
Sea to Summit focuses on comfortable and lightweight products
Item #STS006Y

Material: [face fabric] 10D nylon, [lining] 7D nylon
Insulation: RDS 850+ Loft Premium Goose Ultra-Dry Down
Shape: contoured mummy
Zipper: 1/2-zipper
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] 38in
Bag Length: [regular] 6ft, [long] 6ft 6in
Pockets: none
Pad Retainer: no
Venting: 2-way zipper
Fill Weight: [regular] 6.3oz, [long] 7.2oz
Degree: 40F
European Norm/ISO Comfort Rating: 48ºF
European Norm/ISO Lower Limit Rating: 40ºF
Storage Sack: storage cell
Stuff Sack: Ultra-Sil compression bag
Stuff Size: 15 x 8in
Claimed Weight: [regular] 12oz, [long] 13.6oz
Manufacturer Warranty: lifetime

Reviews

Q&A

What do you think about this product?

Overall Rating

4.5 based on 154 ratings

Review Summary

1 Stars - 4 reviews

2 Stars - 2 reviews

3 Stars - 6 reviews

4 Stars - 22 reviews

5 Stars - 120 reviews

Customer Images

View

Selecting an option will reload the available reviews on the page

5 out of 5 stars

January 9, 2025

Ideal Ultralight Ultra-compact Sleeping Bag

[This review was collected as part of a promotion.] I bought this for carrying with me for paragliding vol-biv in warmer climates as a cozy supplement to sleeping in my wing. The low weight and minimal space requirements make it a great piece of kit. I did need to put it in the dryer and shake the down through the baffles to optimize the insulation, but overall I’m very happy with it!

Christopher K.