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Sea to Summit

Spark Pro Ultralight -9 Down Sleeping Bag

Lightweight and functional bag that is optimised for comfort and versatility on lightweight adventures

Down Filled Lightweight

Select options

Scales

Packability

Ultra Compact

Compact

Mid Size

Warmth

Summer

Multi-season

Alpine

Weight

Ultralight

Lightweight

Midweight

Product Specifications

Average weight 784g (Regular), 861g (Long)

Compression 13 Litres (both sizes)

Fill weight 480g (Regular), 550g (Long)

Fill ULTRA-DRY Goose Down 900+ Loft, RDS certified

Fits to 185cm (Regular), 198cm (Long)

Foot width 51cm (Regular), 56cm (Long)

Inner 10D nylon with a non-PFC DWR finish

Outer 10D nylon

Shoulder width 77.5cm (Regular), 82.5cm (Long)

Temp rating minus 3°C comfort rating woman / minus 9°C Lower comfort rating for men; Temperature rated in accordance with ISO 23537-1:2022

Trusted Opinions

Our experts haven't reviewed this product yet.

Features

• Mummy Fit: Fitted cut with generous anatomical footbox and technical hood, to maximise thermal efficiency and minimise bulk and weight
• bluesign®-approved 10D nylon shell and lining fabric offers breathability, protection and effective temperature regulation for premium comfort in the outdoors
• 10D nylon's waterproof and breathable features offer added protection and prevents exposure to tent wall condensation
• 900+ Fill Power, RDS-certified, Goose Down with ULTRA-DRY Down treatment for improved water resistance in damp conditions
• Free Flow Zip System for reliable, snag-free operation and minimal weight:
  • Primary zip: full-length #5 with zip-plow and two sliders
  • Secondary zip: 1/4-length #3 with zip-plow and two sliders
  • Footbox zip: #3 with two sliders
• Vertical chest baffles, horizontal baffles in the lower half and base, box wall baffle construction throughout
• Technical fitted hood with soft touch adjustment, extra deep for cosy-like feel
• Fitted front draft collar: scalloped over the neck and oversized at the shoulders
• Pairs with women's Sea to Summit bags and the QuiltLock System allows integration with Sea to Summit quilts
• Comes with an Ultra-Sil compression bag and a storage cell

Sea to Summit

Spark Ultralight -9 Down Sleeping Bag

Lightweight down mummy-shaped bag for cold conditions

Down Filled Water Resistant Lightweight

Select options

Scales

Packability

Ultra Compact

Compact

Mid Size

Warmth

Summer

Multi-season

Alpine

Weight

Ultralight

Lightweight

Midweight

Product Specifications

Average weight 730g (Regular), 786g (Long)

Compression 13 Litres (both sizes)

Fill weight 480g (Regular), 540g (Long)

Fill ULTRA-DRY Goose Down 850+ Loft, RDS certified

Fits to 185cm (Regular), 198cm (Long)

Foot width 51cm (Regular), 56cm (Long)

Inner 10D nylon with a non-PFC DWR finish

Outer 10D nylon

Shoulder width 77.5cm (Regular), 82.5cm (Long)

Temp rating minus 2°C comfort rating woman / minus 9°C Lower comfort rating for men; Temperature rated in accordance with ISO 23537-1:2022

Trusted Opinions

Staff (1)

Thais Bivouac Team Member

If your goal is to transition into more lightweight gear and carry less bulky items, then start with your sleeping bag. The Sea To Summit Spark series are the best lightweight to warmth ratio we stock in our store. The face fabric is only 10D which is why you can see the 850+ down through it and allows the sleeping bag to compress into a tiny bag. The -9c model is a great option if you are looking for a 3-season sleeping bag or even 4-seasons if you sleep warm and don't mind adding a couple of layers. I would use this bag anytime between late winter to beginning of winter if camping and all the way through NZ winter if hutting. The baffles by the torso area have been designed vertically so that the down stays in place when moving around to stop any cold spots.

Something to keep in mind is that due to the face fabric being so thin, this would not suit someone who is sleeping in harsh conditions and is rough with their gear. The mummy shape is very tapered and could feel restrictive for people who like to move around in their sleep and the zips don't unzip all the way around. Keep in mind those things when considering this model, but you will need to make some compromises if wanting to transition to lightweight gear.

Fit tip:

Tapered mummy shape

Trusted Opinions

Staff (1)

Thais Bivouac Team Member

If your goal is to transition into more lightweight gear and carry less bulky items, then start with your sleeping bag. The Sea To Summit Spark series are the best lightweight to warmth ratio we stock in our store. The face fabric is only 10D which is why you can see the 850+ down through it and allows the sleeping bag to compress into a tiny bag. The -9c model is a great option if you are looking for a 3-season sleeping bag or even 4-seasons if you sleep warm and don't mind adding a couple of layers. I would use this bag anytime between late winter to beginning of winter if camping and all the way through NZ winter if hutting. The baffles by the torso area have been designed vertically so that the down stays in place when moving around to stop any cold spots.

Something to keep in mind is that due to the face fabric being so thin, this would not suit someone who is sleeping in harsh conditions and is rough with their gear. The mummy shape is very tapered and could feel restrictive for people who like to move around in their sleep and the zips don't unzip all the way around. Keep in mind those things when considering this model, but you will need to make some compromises if wanting to transition to lightweight gear.

Fit tip:

Tapered mummy shape

Features

• Mummy Fit: Fitted cut with generous anatomical footbox and technical hood, to maximise thermal efficiency and minimise bulk and weight
• bluesign®-approved 10D nylon shell and lining fabric offers breathability, protection and effective temperature regulation for premium comfort in the outdoors; PFC-free DWR (durable water repellent) treatment keeps the hood and footbox highly water resistant
• 850+ Fill Power, RDS-certified, Goose Down with ULTRA-DRY Down treatment for improved water resistance in damp conditions
• 3/4-length #5 zip with anti-snag zip plow and two sliders
• Vertical chest baffles, horizontal baffles in the lower half and base, box wall baffle construction throughout
• Technical fitted hood with soft touch adjustment, extra deep for cosy-like feel
• Standard front draft collar
• Single, down-filled, draft tube along the top of zips
• Pairs with women's Sea to Summit bags and the QuiltLock System allows integration with Sea to Summit quilts
• Comes with an Ultra-Sil compression bag and a storage cell
• Ultralight does not mean ultra-tight: The Spark mummy sleeping bags are snug but still have adequate wiggle room for the performance-oriented, backcountry user

Spark Pro Ultralight -9 Down Sleeping Bag

Spark Ultralight -9 Down Sleeping Bag