Compare Products

Share this comparison

Clearance

Clearance

Sea to Summit

Trek -9 Down Sleeping Bag

Warm, versatile and spacious bag with ULTRA-DRY Duck Down perfect for vehicle-based travels and overnight camping

Down Filled Water Resistant Recycled

Select options

Scales

Packability

Ultra Compact

Compact

Mid Size

Warmth

Summer

Multi-season

Alpine

Weight

Ultralight

Lightweight

Midweight

Product Specifications

Average weight 1436g (Regular), 1611g (Long)

Compression 20 Litres (both sizes)

Fill weight 635g (Regular), 735g (Long)

Fill ULTRA-DRY Duck Down 650+ Loft, RDS certified

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

Foot width 65.5cm (Regular), 71.5cm (Long)

Inner 20D recycled polyester with a non-PFC DWR finish

Outer 20D recycled polyester

Shoulder width 79cm (Regular), 84cm (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

• Semi-rectangular fit: Spacious and generous, a roomy fit to give you room to move inside the bag, regardless of your sleeping position
• Sustainable construction with 100% recycled bluesign®-approved 20D polyester shell and lining, a PFC-free water-repellent coating and RDS down
• 650+ Fill Power, RDS-certified, 85% Down Cluster Premium Duck Down with ULTRA-DRY Down treatment for improved water resistance in damp conditions
• Free Flow Zip System for reliable, snag-free operation, to provide superior ventilation and allow the bag to be used as a comforter/quilt:
  • Primary zip: full-length #5 zip with zip-plow and two sliders
  • Secondary zip: half-length #5 zip with zip-plow and two sliders
  • Foot box zip: #5 with two sliders
  • Vertical chest baffles, horizontal baffles lower half and base, box wall baffle construction throughout
  • Shaped hood and oversized zip draft tubes to seal in warmth and keep cold out
  • Fitted front draft collar: scalloped over the neck and oversized at the shoulders.
  • Internal pocket for phone / GPS / valuables
  • QuiltLock System allows Sea to Summit quilts to be locked into place over the top of the Trek, giving you modular and versatile sleeping bag
  • Form a snug double sleeping bag by zipping to any women's Sea to Summit sleeping bags
  • Includes lightweight Ultra-Sil compression bag and 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

Sea to Summit

Spark Ultralight -9 Women's Down Sleeping Bag

Lightweight down female-specific 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 930g (Regular), 1027g (Long)

Compression 13 Litres (both sizes)

Fill weight 685g (Regular), 780g (Long)

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

Fits to 170cm (Regular), 185cm (Long)

Foot width 46cm (Regular), 51cm (Long)

Inner 10D nylon with a non-PFC DWR finish

Outer 10D nylon

Shoulder width 71cm (Regular), 76cm (Long)

Temp rating minus 9°C comfort rating woman / minus 15°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

• Women's Mummy Fit: Fitted cut with generous anatomical footbox and technical hood, to maximise thermal efficiency and minimise bulk and weight. Wider at the hips and narrower at the shoulders for a better fit and heat retention for women.
• 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
• Double draft collar
• Single, down-filled, draft tube along the top of all zips
• QuiltLock System and drawcord footbox enables quilts to be secured to Sea to Summit sleeping bags for added functionality and freedom
• 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

Clearance

Sea to Summit

Trek -9 Women's Down Sleeping Bag

Warm, versatile and spacious bag with ULTRA-DRY Duck Down perfect for vehicle-based travels and overnight camping

Down Filled Insulated Water Resistant

Select options

Scales

Packability

Ultra Compact

Compact

Mid Size

Warmth

Summer

Multi-season

Alpine

Weight

Ultralight

Lightweight

Midweight

Product Specifications

Average weight 1612g (Regular), 1800g (Long)

Compression 26 Litres (both sizes)

Fill weight 800g (Regular), 925g (Long)

Fill ULTRA-DRY Duck Down 650+ Loft, RDS certified

Fits to 170cm (Regular), 185cm (Long)

Foot width 60cm (Regular), 65.5cm (Long)

Inner 20D recycled polyester with a non-PFC DWR finish

Outer 20D recycled polyester

Shoulder width 72.5cm (Regular), 77.5cm (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

• Semi-rectangular women's-specific fit is designed for spacious comfort when you're camping or traveling: slightly narrower at the shoulders and roomier through the hip area. Regardless of the position you sleep in (figure-four, on your side or on your stomach), this shape provides a significantly higher level of comfort by giving you the room to move without compressing the insulation.
• Women's sleeping bags have additional insulation compared to unisex bags, positioned using different body mapping for thermal performance exactly where it is needed
• Sustainable construction with 100% recycled bluesign®-approved 20D polyester shell and lining, a PFAS-free water-repellent coating and RDS down
• 650+ Fill Power, RDS-certified, Down with ULTRA-DRY Down treatment for improved water resistance in damp conditions
• Free Flow Zip System for reliable, snag-free operation, to provide superior ventilation and allow the bag to be used as a comforter/quilt:
  • Primary zip: full-length #5 zip with zip-plow and two sliders
  • Secondary zip: half-length #5 zip with zip-plow and two sliders
  • Foot box zip: #5 with two sliders
  • Vertical chest baffles, horizontal baffles lower half and base, box wall baffle construction throughout
  • Generous fitted hood with two soft touch adjustments; fits a Sea to Summit regular pillow
  • Fitted front draft collar: scalloped over the neck and oversized at the shoulders
  • Single, synthetic-filled, draft tube along the top of all zips
  • Internal pocket for phone / GPS / valuables
  • Form a snug double sleeping bag by zipping to other Sea to Summit sleeping bags
  • Includes lightweight Ultra-Sil compression bag and storage cell

Trek -9 Down Sleeping Bag

Spark Ultralight -9 Down Sleeping Bag

Spark Ultralight -9 Women's Down Sleeping Bag

Trek -9 Women's Down Sleeping Bag