Sea To Summit Spark III Sleeping Bag
Sea To Summit Spark III Sleeping Bag
Sea To Summit Spark III Sleeping Bag
Sea To Summit Spark III Sleeping Bag

Sea To Summit Spark III Sleeping Bag

Regular price $799.00 Sale price$719.10 Save $79.90
Tax included. Shipping calculated at checkout.

Bag Length

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The Spark Series spans everything from an ultralight liner to an expedition weight mid-winter bag. While the end usage is very different, they reflect a design ethos of matching weather conditions to the lightest bag possible.

The secret to the impressive performance is a combination of premium materials and careful design. The RDS 850+ Loft premium goose down, light-gauge #3 YKK zip and high performance 10D Nylon shell and 7D lining fabrics, set the stage for superior performance. These materials are combined with a contoured mummy design for efficient insulation, and that mummy design is then tweaked for each model to best fit the use scenario.

Sea To Summit's ULTRA-DRY Down water-repellent treatment protects the down from external moisture and condensation from the inside of the bag, virtually eliminating the negative effects moisture has on down. All Sea to Summit Down Sleeping Bags use Responsible Down Standard (RDS) certified down. The ULTRADRY Down protection also makes the Spark an impressive hard-alpine or adventure racing bag, where every gram is counted and down has never been a viable option.


  • Ultralight 7D and 10D fabrics for minimal weight and packed size

  • RDS 850+ Loft Premium Goose ULTRA-DRY Down for maximum insulation value

  • Contoured mummy shape for comfort and efficient insulation

  • Vertical chest baffles prevent down migration and cold spots

  • Uses a full box baffle construction to accommodate extra down and reduce cold spots

  • Expedition mummy bag sizing provides extra space for layered clothing or extra wriggle room

  • Vertical baffles on chest optimises positions of down to prevent it moving during use

  • Full side zip with two sliders provides easy access and extra ventilation options

  • Zipper draft tube, hood and front neck draft collar to prevent warmth being lost when it's needed

  • Includes lightweight Ultra-Sil Nano compression bag for compact storage

  • Shell: 100% Nylon, Lining: 100% Nylon, Primary Filling Material: GOOSE DOWN (Min. 90% Down), Stuffsack: 100% Nylon excluding Trims




Bag Weight



Compressed Vol



Compression Sack

XS - 6L to 2L

XS - 6L to 2L

Fill Weight



Fits Up To Height



Comfort Temperature Rating

-2 °C

-2 °C

Lower Limit Temperature Rating

-8 °C

-8 °C

Extreme Temperature Rating

-26 °C

-26 °C

Outer Material

Ultralight 10D nylon shell

Ultralight 10D nylon shell

Fill Material

RDS 850+ Loft Premium Goose ULTRADRY Down™ (Min. 90% Down)

RDS 850+ Loft Premium Goose ULTRADRY Down™ (Min. 90% Down)

Season Rating

2 Season

2 Season

The standard local delivery time from our store in Melbourne for orders placed before noon is 2–7 business days via Australia Post standard delivery. Express Post is also available. Please see our Shipping page for more details. International Orders are subject to flight availability.

If you'd like to know availability and delivery times for a specific item please contact us and we will get back to you asap.

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