Sea to Summit Spark -9C/15F Down Sleeping Bag

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UOG TOP PICK—Sea to Summit have redesigned its renowned Spark sleeping bag line, featuring high-quality materials and ethically sourced down. The hood and foot box are now made of a waterproof material, providing enhanced protection against condensation. This innovative feature is particularly beneficial for those utilizing a single-skin tent, one of our top picks.

Sea to Summit says: 

The Spark sleeping bag is the perfect option for lightweight adventures that puts comfort at the forefront. The optimal warmth to weight ratio and 850+ FILL Power makes this bag as comfortable as it is compact and easily packable.

Our Verdict

Sea to Summit have redesigned its renowned Spark sleeping bag line. The Spark series continues to be made with high-quality materials, using 850+ ethically sourced down treated with Sea to Summit’s Dry Down coating. This coating enhances the down’s ability to loft effectively in moist conditions, repel water, and dry rapidly.

The baffle configuration remains the same, featuring vertical baffles spanning the chest to prevent down migration and horizontal baffles employed across the lower section,  a box wall baffle construction has been employed throughout the design, this stops down migration and also eliminates cold spots, enhancing overall performance. A draft collar has been added to help the bag retain warm air and prevent cold air from entering.The Spark comes with a ¾-length zip in its -9°C/15°F version. This allows for a broader temperature range for comfortable use, providing flexibility to open the bag and release heat when needed. Making it more of a late spring/ early summer bag, as well as being able to handle lower temperatures.

The outer fabric has been upgraded to a uniform 10-denier Nylon, eliminating the ‘see-through’ appearance of previous Spark bags. A significant improvement is the waterproof 10-denier Nylon material used at the hood and foot box. These areas are most likely to come in contact with the tent wall, which can suffer from condensation, especially in single-skin tents. This extra layer of protection keeps the down dry.

The hood has also been redesigned to provide a more ‘traditional fit’. For fans of the classic Spark, there are many changes to celebrate. 

– Reviewed by Ultralight Outdoor Gear

Features

• Goose Down with Ultra Dry Down treatment for improved water resistance in damp conditions.
• Featuring 10 Denier Nylon and 10D Nylon, these lightweight fabrics offer breathability, protection and effective temperature regulation for premium comfort
• 10D Nylon’s waterproof and breathable features offer added protection and prevents exposure to tent wall condensation.
• The Mummy Fit maximises thermal efficiency and offers greater heat retention with a lightweight design for warmth,  compactness and comfort in the outdoors.

Specifications

Temperature Rating

• EN13537:2012 Comfort: -2°C | 29°F
• EN13537:2012 Comfort Limit: -8°C | 18°F

Regular Specs

• Weight: 740g (excludes storage bags)
  
• Fill weight: 480g
  
• Fits up to: 6 ft / 185 cm
• Internal Width Shoulder: 155cm
• Internal Width Waist: 135cm
• Internal Width Feet: 102cm
• Compressed size: 13L

Long Specs

• Weight: 797g (excludes storage bags)
  
• Fill weight: 540
  
• Fits up to: 6 ft 6 in / 198 cm
• Internal Width Shoulder: 165cm
• Internal Width Waist: 145cm
• Internal Width Feet: 112cm
• Compressed size: 13L

Fit

• Mummy Fit: Fitted cutwith generous footbox and technical hood, to maximise thermal efficiency and minimise bulk and weight.

Material & Construction

• Insulation: 850+ FILL Power, RDS-certified, Goose Down with Ultra Dry Down treatment for improved water resistance  in damp conditions
• Fabric: 10-Denier Nylon shell and lining. 10-Denier Nylon waterproof-breathable hood and footbox
• Zipper:  Primary zip – 3/4 length #5 with zip-plow and two sliders
• Baffle Construction:  box wall baffle construction throughout.
• Collar:  Double draft collars
• Hood: Technical fitted hood with soft touch adjustment. Extra deep for cosy like feel.
• Draft Tube:-Single, down-filled, draft tube along the top of all zippers.

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• Sea to Summit Sleeping Bag & Quilt Guide
• About Sea to Summit
• The EN13537 Standard
• All About Down