Sea to Summit Spark regular bag closed hood view highlighting compact warmth for backpacking.
Sea to Summit Spark regular interior view shows breathable liner and cozy night comfort.
Sea to Summit Spark long closed hood view demonstrates extended warmth for tall hikers.
Sea to Summit Spark double closed hood view illustrates roomier comfort for two sleepers.
Sea to Summit Spark ultralight 10D shell close-up emphasizes water resistance and packability.
Sea to Summit Spark 850-fill down close-up highlights premium warmth and loft in damp conditions.
Sea to Summit Spark compression sack and storage cube in-use enables easy transport.
Sea to Summit Spark regular bag closed hood view highlighting compact warmth for backpacking.
Sea to Summit Spark regular interior view shows breathable liner and cozy night comfort.
Sea to Summit Spark long closed hood view demonstrates extended warmth for tall hikers.
Sea to Summit Spark double closed hood view illustrates roomier comfort for two sleepers.
Sea to Summit Spark ultralight 10D shell close-up emphasizes water resistance and packability.
Sea to Summit Spark 850-fill down close-up highlights premium warmth and loft in damp conditions.
Sea to Summit Spark compression sack and storage cube in-use enables easy transport.

Sea to Summit Spark 15°F Ultralight Down Sleeping Bag – Double

Ultralight warmth for wherever the trail leads The Sea to Summit Spark 15°F Ultralight Down Sleeping Bag in Double offers...
Vendor: Sea to Summit
$1,970.82
$1,970.82
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Subtotal: $1,970.82
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Sea to Summit Spark regular bag closed hood view highlighting compact warmth for backpacking.

Sea to Summit Spark 15°F Ultralight Down Sleeping Bag – Double

$1,970.82
Sea to Summit Spark regular bag closed hood view highlighting compact warmth for backpacking.
Sea to Summit Spark regular interior view shows breathable liner and cozy night comfort.
Sea to Summit Spark long closed hood view demonstrates extended warmth for tall hikers.
Sea to Summit Spark double closed hood view illustrates roomier comfort for two sleepers.
Sea to Summit Spark ultralight 10D shell close-up emphasizes water resistance and packability.
Sea to Summit Spark 850-fill down close-up highlights premium warmth and loft in damp conditions.
Sea to Summit Spark compression sack and storage cube in-use enables easy transport.

Sea to Summit Spark 15°F Ultralight Down Sleeping Bag – Double

$1,970.82
Description
Description
x

Ultralight warmth for wherever the trail leads

The Sea to Summit Spark 15°F Ultralight Down Sleeping Bag in Double offers serious warmth at a featherweight, making it a versatile choice for backpacking, bikepacking, and multi-day tours. Built around a contoured mummy shape, it minimizes cold spots while preserving a natural sleeping position, so you can wake up ready for the next push. The bag pairs high-loft 850+ fill power down with moisture-aware treatment to help loft and performance stay strong in rugged, damp environments without relying on harsh chemicals.

Key reasons it stands out

  • 15°F (-9°C) rating targets two-season comfort for backpacking and cycling trips.
  • 850+ fill power down is RDS certified and treated with Ultra-Dry Down to improve moisture tolerance while retaining loft.
  • Ultralight 10D shell with a PFC-free DWR helps keep the hood and footbox resistant to light moisture, while a breathable liner enhances comfort.
  • Full box baffles, a contoured mummy shape, and a reliable YKK #5 zipper ensure warmth, stability, and snag-free operation.
  • Includes practical extras: Ultra-Sil compression sack and a storage cube for efficient packing and maintenance.
  • Available in Regular, Long, and Double sizes with clear height recommendations for a natural sleeping posture.
  • Sea to Summit offers a lifetime warranty against defects in materials or workmanship.

Two bulleted lists for quick scanning

  • Weight-conscious warmth: Combines a low-profile shell with high-loft down to deliver warmth without bulk.
  • Moisture-resilient design: Ultra-Dry Down and RDS-certified down help preserve loft when conditions get damp.
  • Durable, easy-care construction: PFC-free DWR, breathable liner, and snag-free zipper operation.
  • Backpacking versatility: Suitable for 2-season use on trails and bike routes.
  • Touring-friendly fit: Contoured shape avoids pinching, aligning with a natural sleep stance for longer trips.
  • Packability on the move: Comes with a compact sack and a storage cube for organized carry.

For durability, Sea to Summit backs this bag with a lifetime warranty. While no sleeping bag can guarantee outcomes, the Spark is designed to help you stay warm and comfortable in the conditions implied by its temperature rating, so you can focus on the journey rather than the gear.

FAQ

Q: What sizes are available for the Sea to Summit Spark 15-Degree Ultralight Down Sleeping Bag?

A: Available in Regular, Long, and Double; Regular up to 6'0", Long up to 6'6", Double up to 6'6".

Q: Does this bag address moisture and loft while traveling?

A: Down insulation uses Ultra-Dry treatment and RDS-certified 850+ fill to help loft and warmth when damp.

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Additional Information
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Shipping & Return
Shipping & Return
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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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