Compare Products

Share this comparison

Sea to Summit

Ascent -1 Regular Down Sleeping Bag

Designed for comfort and adaptability and suited to a wide range of adventures

Down Filled Water Resistant Lightweight

Add to cart Adding... Sold out

Scales

Packability

Ultra Compact

Compact

Mid Size

Warmth

Summer

Multi-season

Alpine

Weight

Ultralight

Lightweight

Midweight

Product Specifications

Compression 8 Litres (both sizes)

Fill ULTRA-DRY Goose Down 750+ Loft, RDS certified

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

Foot width 59.5cm (Regular), 64.5cm (Long)

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

Outer 20D recycled polyester, 10D nylon hood and footbox

Shoulder width 78cm (Regular), 84cm (Long)

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

Fill weight 300g (Regular), 343g (Long)

Trusted Opinions

Staff (1)

Steph Bivouac Team Member

The Ascent is a great all rounder sleeping bag is rated to keep you toasty in a light frost. With 750 loft down they are packable enough to throw in your backpack, and also appropriate for car camping adventures. With the ability to open the bag up for use as a blanked, but two zips, one for the footbox, and the other along the side where you can zip the male and female bags together. The hooded bag is roomy with its rectangular shape and internal zip pocket on the inside for overnight storage of small items you want to keep close at hand. The Ascent is a great all rounder sleeping bag is rated to keep you toasty in a light frost. If you are particularly susceptible to the cold, it may be worth pairing with a liner

Fit tip:

N/A

Trusted Opinions

Staff (1)

Steph Bivouac Team Member

The Ascent is a great all rounder sleeping bag is rated to keep you toasty in a light frost. With 750 loft down they are packable enough to throw in your backpack, and also appropriate for car camping adventures. With the ability to open the bag up for use as a blanked, but two zips, one for the footbox, and the other along the side where you can zip the male and female bags together. The hooded bag is roomy with its rectangular shape and internal zip pocket on the inside for overnight storage of small items you want to keep close at hand. The Ascent is a great all rounder sleeping bag is rated to keep you toasty in a light frost. If you are particularly susceptible to the cold, it may be worth pairing with a liner

Fit tip:

N/A

Features

• Relaxed Mummy Fit: A more relaxed yet tapered mummy fit with high thermal performance
• Lightweight 100% recycled 20D nylon shell with a non-PFC DWR finish to protect against wind and moisture and a 20D recycled nylon liner for greater comfort
• bluesign®-approved fabrics
• 750+ 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: 1/2-length #3 with zip-plow and two sliders
  • Footbox zip: #5 with two sliders
• Vertical chest baffles, horizontal baffles in the lower half and base, box wall baffle construction throughout
• Generous fitted hood with two soft touch adjustments and fits a Sea to Summit regular pillow
• Fitted front draft collar: scalloped over the neck and oversized at the shoulders
• Single, down-filled draft tube along the top of zips
• Internal pocket for phone / GPS / valuables
• Pairs with women's Sea to Summit bags for a snug double sleeping bag
• 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 -1 Women's Down Sleeping Bag

Lightweight down female-specific mummy-shaped bag

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

Compression 5 Litres (Regular), 8 Litres (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 1°C comfort rating woman / minus 7°C Lower comfort rating for men; Temperature rated in accordance with ISO 23537-1:2022

Average weight 584g (Regular), 639g (Long)

Fill weight 375g (Regular), 430g (Long)

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
• Half-length #5 zip with anti-snag zip plow and two sliders
• Vertical chest baffles, horizontal baffles in the lower half and base, box wall baffles in the top half and sewn-through quilted construction lower half
• 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 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

Sea to Summit

Boab -1 Synthetic Sleeping Bag

Roomy, synthetic sleeping bag made for cosy camping nights

Synthetic Fill Insulated Water Resistant

Select options

Scales

Packability

Ultra Compact

Compact

Mid Size

Warmth

Summer

Multi-season

Alpine

Weight

Ultralight

Lightweight

Midweight

Product Specifications

Compression Regular: 10.2-litres using 20-litres compression sack Long: 12.8-litres using 20-litres compression sack

Fill Revive Loft 100% RCS-certified, post-consumer, recycled, multi-denier synthetic insulation

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

Foot width 50cm (Regular), 55cm (Long)

Inner 50D bluesgin®-approved recycled polyester

Outer 50D bluesign®-approved, recycled polyester with PFAS-free DWR

Shoulder width 76cm (Regular), 81cm (Long)

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

Average weight 1391g (Regular), 1563g (Long)

Trusted Opinions

Our experts haven't reviewed this product yet.

Features

• Roomy, tapered rectangular shape is ideal for side-sleepers
• 50D bluesign®-approved RCS-certified recycled shell and liner, Revive Loft insulation and PFAS-free DWR finish allows you to rest easy even in damp conditions
• Full side zip extends through the footbox to use as a blanket
• Double zip sliders let you customise your ventilation based off the temperature
• YKK #5 zip with zip plough provides reliable, snag-free operation
• Draught tube along zip helps retain warmth and keeps out cool air
• Comes with compression sack
• 1% of each Boab Synthetic Sleeping Bag sale supports 1% for the Planet® partners preserving biodiversity

Sea to Summit

Hamelin -1 Women's Synthetic Sleeping Bag

Performance-oriented synthetic sleeping bag designed for comfort

Synthetic Fill Insulated Water Resistant

Select options

Scales

Packability

Ultra Compact

Compact

Mid Size

Warmth

Summer

Multi-season

Alpine

Weight

Ultralight

Lightweight

Midweight

Product Specifications

Compression Regular: 12.7-litres using 26-litres compression sack Long: 13.3-litres using 26-litres compression sack

Fill Revive Loft 100% RCS-certified, post-consumer, recycled, multi-Denier synthetic insulation

Fits to 170cm (Regular), 183cm (Long)

Foot width 54.5cm (Regular), 59.5cm (Long)

Inner 20D bluesgin®-approved recycled polyester

Outer 20D bluesign®-approved, recycled polyester with PFAS-free DWR (durable water resistant)

Shoulder width 72.5cm (Regular), 77.5cm (Long)

Temp rating Minus 1°C comfort rating woman / minus 8°C Lower comfort rating for men; Temperature rated in accordance with ISO 23537-1:2022

Average weight 1447g (Regular), 1645g (Long)

Fill weight 1070g (Regular), 1220g (Long)

Rolled size Compressed volume: 12.7 Litres (Regular), 13.3 Litres (Long)

Trusted Opinions

Staff (1)

Annie Bivouac Team Member

This bag is a really good option for anyone who isn’t a down fan. It has a cozy, tapered fit and is easy to customise for warmth (e.g. pop your feet out the bottom, use as a quilt, tighten around the hood). While it does end up being a bit bulkier and heavier than its down-filled counterparts, you gain durability and effectiveness even in damp conditions. If you’re looking for a solid down alternative that you’ll be tramping or camping in (that also doesn’t break the bank), this is absolutely a really good pick. For a warmer option in rougher conditions, this bag also comes in a -9 option.

Trusted Opinions

Staff (1)

Annie Bivouac Team Member

This bag is a really good option for anyone who isn’t a down fan. It has a cozy, tapered fit and is easy to customise for warmth (e.g. pop your feet out the bottom, use as a quilt, tighten around the hood). While it does end up being a bit bulkier and heavier than its down-filled counterparts, you gain durability and effectiveness even in damp conditions. If you’re looking for a solid down alternative that you’ll be tramping or camping in (that also doesn’t break the bank), this is absolutely a really good pick. For a warmer option in rougher conditions, this bag also comes in a -9 option.

Features

• Weight-efficient Contour shape is ideal for natural sleep position such as your side, in a figure-four
• 20 Denier, bluesign® RCS-certified recycled shell and liner
• Soft, packable, recycled Revive Loft insulation and PFAS-free DWR finish will keep you warm even in wet conditions
• Technical hood, a draught collar and draught tubes retain your warmth on chilly evenings
• Free-Flow full-length side zip with double sliders extends through the footbox for customisable ventilation or to open as a quilt
• Secondary side zip provides arms-free functionality
• YKK #5 zip with zip plough provides reliable, snag-free operation
• Draught tube along zip helps retain warmth and keeps out cool air
• Comes with compression sack
• 1% of each Hamelin Synthetic Sleeping Bag sale supports 1% for the Planet® partners preserving biodiversity

Ascent -1 Regular Down Sleeping Bag

Spark Ultralight -1 Women's Down Sleeping Bag

Boab -1 Synthetic Sleeping Bag

Hamelin -1 Women's Synthetic Sleeping Bag