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Spark Ultralight -18 Down Sleeping Bag
Expert Pick
Packability
Ultra Compact
Compact
Mid Size
Warmth
Summer
Multi-season
Alpine
Weight
Ultralight
Lightweight
Midweight
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Average weight
1113g (Regular), 1204g (Long)
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Compression
20 Litres (both sizes)
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Fill weight
840g (Regular), 945g (Long)
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Fill
ULTRA-DRY Goose Down 850+ Loft, RDS certified
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Fits to
185cm (Regular), 198cm (Long)
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Foot width
51cm (Regular), 56cm (Long)
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Inner
10D nylon with a non-PFC DWR finish
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Outer
10D nylon
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Shoulder width
77.5cm (Regular), 82.5cm (Long)
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Temp rating
minus 10°C comfort rating woman / minus 18°C Lower comfort rating for men; Temperature rated in accordance with ISO 23537-1:2022
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- 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
- Double draft collars
- 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
