Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag
Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag Spark Pro Ultralight -1 Down Sleeping Bag

Spark Pro Ultralight -1 Down Sleeping Bag

SKU: STS-10221-BELUGA

Lightweight and functional bag that is optimised for comfort and versatility on lightweight adventures. View full details
Colour: BELUGA
Size: Regular

$999.99

or 4 interest-free payments of $249.99 with
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Lightweight and functional, the Spark Pro Ultralight -1 Down Sleeping Bag is optimised for comfort and versatility on lightweight adventures. It combines ULTRA-DRY 900+ loft goose down with soft 10D nylon, a mummy shape for efficient insulation and minimal bulk with a Free Flow Zip System for maximum ventilation and the ability to open it out as a quilt. It comes with a compression stuff sack for compact packing.
Packability
Ultra Compact
Compact
Mid Size
Warmth
Summer
Multi-season
Alpine
Weight
Ultralight
Lightweight
Midweight
  • 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
  • Hybrid box baffles with vertical chest baffles, horizontal baffles in the lower half and base, box wall baffles at the top half of the bag and sewn through quilted construction in the lower half
  • 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
Average weight
619g (Regular), 672g (Long)
Compression
8 Litres (both sizes)
Fill
ULTRA-DRY Goose Down 900+ Loft| RDS certified
Fill weight
310g (Regular), 356g (Long)
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
3°C comfort rating woman / minus 1°C Lower comfort rating for men; Temperature rated in accordance with ISO 23537-1:2022

ULTRA-DRY Downâ„¢: With the introduction of water-repellent ULTRA-DRY Downâ„¢ Seat to Summit have virtually eliminated the negative effects moisture has on down. The ULTRA-DRY Downâ„¢ water-repellent treatment protects the down from external moisture and condensation from inside the bag. It is a permanent (no loss of treatment effect has been seen in over 14 wash cycles) Nano-level water repellent polymer treatment applied to Sea to Summit high loft, high quality down. The Nano-thin treatment vastly improves the down's reaction to water without effecting its weight or loft performance. ULTRA-DRY Downâ„¢ retains over 60% more loft and absorbs 30% less moisture when compared with untreated down. Sea to Summit sleeping bags dry out 60% faster than bags with untreated down. The Nano-level treatment also inhibits bacterial and microbial growth, which makes Sea to Summit sleeping bags more hygienic and improves their lifespan.

Responsible Down Standard (RDS): The RDS is helping to shift the entire down and feather industry towards more humane animal rearing and handling practices. Overseen by the industry leading Textile Exchange, the RDS requires independent, third party assessments of all aspects of animal rearing and handling throughout the entire supply chain. By only using down that meets the audited requirements of the RDS we can have confidence that each phase of the collection process has been completed with the welfare and ethical treatment of waterfowl in mind. To find out more about how the RDS is improving animal welfare during down collection, please visit responsibledown.org (link will open a new window).

Need help? Get in touch

How long will my order take to arrive?

Standard NZ orders are sent via NZ Post Overnight Delivery. Orders placed before 2pm are usually delivered the next working day. Rural deliveries and some remote areas may take a little longer. Oversized items like large packs or tents can take 5–9 working days.

How much does shipping cost?

Shipping is free on New Zealand orders over $150. Orders under $150 have a flat $5 shipping fee. Oversized items incur an additional shipping charge due to their size and weight.

Can I return or exchange an item if it doesn’t fit?

Yes. New and unused items can be returned within 30 days for a refund or exchange, provided they’re in original condition with tags and packaging attached. If you’re unsure about sizing before ordering, our team is always happy to help. Customers are responsible for return shipping costs, but we’ll cover the freight cost of sending out exchanged items.

Can I click & collect my order?

Yes - we offer free Click & Collect from all Bivouac stores. If your item is already available in your selected store, it may be ready the same day. Some items may need to be transferred between stores and can take 3–5 working days. We’ll contact you as soon as your order is ready to collect.

Can I track my order?

Yes. Once your order has been dispatched, you’ll receive a Shipping Confirmation email with your NZ Post tracking link and details. All online orders are fully tracked so you can follow your delivery from dispatch through to arrival.

Spark Pro Ultralight -1 Down Sleeping Bag

Spark Pro Ultralight -1 Down Sleeping Bag

BELUGA

$999.99

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Spark Pro Ultralight -1 Down Sleeping Bag
Lightweight and functional bag that is optimised for comfort and versatility on lightweight adventures
Packability
Ultra Compact
Compact
Mid Size
Warmth
Summer
Multi-season
Alpine
Weight
Ultralight
Lightweight
Midweight

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