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Spark Pro Ultralight -9 Down Sleeping Bag Regular packed in compression sack and held by model Stowed in storage bag
Spark Pro Ultralight -9 Down Sleeping Bag
Lightweight and functional bag that is optimised for comfort and versatility on lightweight adventures
Down Filled Lightweight
Packability
Ultra Compact
Compact
Mid Size
Warmth
Summer
Multi-season
Alpine
Weight
Ultralight
Lightweight
Midweight
Average weight
784g (Regular), 861g (Long)
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
Compression
13 Litres (both sizes)

Our experts haven't reviewed this product yet.

  • 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
Spark Ultralight -9 Down Sleeping Bag Spark Ultralight -9 Down Sleeping Bag Spark Ultralight -9 Down Sleeping Bag
Spark Ultralight -9 Down Sleeping Bag
Lightweight down mummy-shaped bag for cold conditions
Down Filled Water Resistant Lightweight
Packability
Ultra Compact
Compact
Mid Size
Warmth
Summer
Multi-season
Alpine
Weight
Ultralight
Lightweight
Midweight
Average weight
730g (Regular), 786g (Long)
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
Compression
13 Litres (both sizes)
Thais
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
  • 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
Clearance
Ultra minus-5-Degree Down Sleeping Bag Ultra minus-5-Degree Down Sleeping Bag Ultra minus-5-Degree Down Sleeping Bag
Ultra minus-5-Degree Down Sleeping Bag
The extremely lightweight and compact 3-season sleeping bag

No scale data available.

Average weight
815g (Medium), 850g (Large)
Fill weight
450g (Medium), 480g (Large)
Fill
850+ cuin/oz European Goose Down (US 90/10)| RDS certified| OEKO-TEX® 100 certified
Fits to
180cm (Medium), 195cm (Large)
Foot width
Inside: 48cm (Medium), 49.5cm (Large)
Inner
Recycled 15D ripstop nylon, OEKO-TEX® 100 certified, PFAS-free, DWR free
Outer
Recycled 10D ripstop nylon Pertex® Quantum, PFAS free, bluesign® approved
Shoulder width
Inside: 74cm (Medium), 75.5cm (Large)
Temp rating
2°C (Comfort)
minus 4°C (Limit)
minus 20°C (Extreme)
Length
203cm (Medium), 218cm (Large)
Rolled size
23 x 14 x 15cm (Medium), 30 x 17 x 17cm (Large)

Our experts haven't reviewed this product yet.

  • Lightest construction with recycled Pertex® Quantum made entirely of recycled polyamide
  • Components such as the zip and webbing are made of recycled PET bottles
  • Downshift function for enhanced heat distribution: the all-round, H-shaped down chambers allow the down to be 'shaken upwards' as required and the sleeping bag to be adapted to the respective temperature conditions
  • Extremely light, very small pack size with passive draft collar
  • Lightweight material and box-baffle construction
  • Optimised fit provides better insulating performance
  • Tuck-stitch seam technology for enhanced durability and moisture protection; multiple fabric layers stitched together and tucked away create stronger seams
  • Adjustable contoured hood and plush draft collar to keep body heat in
  • Adjustable elliptical draft collar nestles around the neck and closes with a snap, minimising draft and heat loss
  • Thick draft tube provides excellent heat retention
  • Anti-snag stiffener ensures smooth zip operation
  • Differential cut (liner is shaped smaller than the shell) for optimal down lofting and comfort
  • 850 fill European duck down 90/10, sourced from producers that do not live-pluck or force-feed the birds
  • 3D triangular footbox with 11 individual down-filled baffles eliminates cold spots
  • Glow-in-the-dark zip pulls with large zip garage for comfort
  • Bartack reinforcements where necessary for enhanced durability
  • Two-way zips increase flexibility and allow for temperature regulation
  • Infoprint inside the bag provides technical information including temperature ratings
  • Comes with a waterproof stuff sack and mesh storage bag
  • Loops at the foot end so you can secure your bag while airing without risk of it being blown away by wind
  • Part of Exped's Fast and Light Series
  • This product meets bluesign® product requirements, which means materials and components have been selected that adhere to rigorous environmental and social criteria during production
  • Carbon neutral: Exped measures, reduces and fully offsets CO2 from manufacturing and shipping this product through myclimate