The Sea To Summit Circuit -1°C Down Long Sleeping Bag helps you wake up feeling refreshed, not restricted in cool conditions. Cocoon yourself in comfort during your next backpacking, camping and outdoor adventure, especially if you prefer extra elbow room under the stars. 

By combining an extra wide width with a semi-tapered rectangular shape, this sleeping bag lets you spread out comfortably just like you would in your own bed. The fabric including a soft touch liner feels buttery-smooth against your skin, while the 650+ fill power down provides pillowy warmth that’s surprisingly lightweight. 

Whether you're zipped in snug, unzipping the footbox on a warmer night or using the wraparound zipper to transform it into a flat quilt, this packable sleeping bag is a choice you can feel good and sleep soundly about. It's crafted from Bluesign approved, 100% recycled fabrics and uses non-PFAS recycled materials to protect the wild places that inspire your adventures.

Key Features:

  • Temp Rating (ISO Lower Limit) : -1°C | 30°F
  • Women’s Temp Rating (ISO Comfort) : 2°C | 36°F
  • Long Length: Accommodates users up to 198cm in height - ideal for taller campers or to stretch out naturally.
  • Semi-tapered Rectangular Shape: Thermally-efficient design provides a cosy feel.
  • Extra Wide Width: Ideal for side sleepers to find a comfortable sleeping position without feeling restricted. 
  • Lightweight and Breathable Premium 20D Fabric: Feather-soft fabrics ensure home away from home comfort. 
  • 650+ Fill Power Ultra-Dry Duck Down: Delivers an impressive warmth-to-weight ratio and is easy to pack down for 2 season performance.
  • Hybrid Box-baffle Construction: Prevents the down from shifting out of place, ensuring consistent warmth throughout your sleeping bag.
  • Worry-Free YKK #5 Coil Zipper: Features a durable zip plow to prevent snagging.
  • Draft Protection Shaped Collar and Down-Filled Draft Tubes: Help prevent heat from escaping for enduring warmth. 
  • Wraparound Zipper: Provides personalised ventilation for airflow on balmy nights, or can be unzipped fully for quilt-like comfort and adaptability.
  • Internal Zip Pocket: Offers a safe, warm place to stash your phone or headlamp snugly. 
  • Eco-Conscious Build: Made with 100% recycled, Bluesign approved fabrics so you can sleep better knowing your camping gear is sustainable.
  • Certified Thermal Reliability: ISO 23537 accreditation ensures that insulation performance remains consistent to its specified temperature ratings.
  • Trusted Durability: ISO-tested performance standards for a long-lasting, reliable sleep system.
Finding the right fit is all about balancing room to move with staying warm. Most Sea To Summit sleeping bags come in Regular and Long fits. For the best thermal efficiency, choose the size closest to your height without being too tight, as excess air inside the bag requires more body heat to warm up.
Generally, the Comfort rating is the sweet spot of temperature at which a cold sleeper (often women) can expect to sleep comfortably in a relaxed position - you’re not fighting to stay warm. The Lower Limit is the temperature at which a warm sleeper (often men) can sleep undisturbed by the cold while in a compact body position to trap in heat.

Brand : Sea To Summit

SKU: S2ST-100904

Model # : 100904

Barcode : 9327868991112  (AD-2)

Gender : Unisex

Length : Long

Shape : Tapered Rectangular

Zipper Position : Left

Insulation Type : Down

Season : 2 Season

Lower Temperature Limit (degrees Celsius) : 0 to -4

Temp Rating (ISO Lower Limit) : -1°C | 30°F

Women’s Temp Rating (ISO Comfort) : 2°C | 36°F

Weight : 910g

Compression Sack : 13L

Fits Up To Height : Short 170cm | Regular 185cm | Long 198cm

Material : 20D Recycled Polyester

Insulation : Non-PFAS, RDS-certified 650+ Fill Power Ultra‑Dry Down

Free shipping on orders over $140 to Australia*
Shipping on small orders (under $140) only $9.95
Shipping on all orders to NZ only $9.95
Express shipping to Australia & NZ only $15

Standard Shipping (AU) – FREE on orders over $140 and $9.95 on orders under $140. Orders are dispatched within 1 business day. Click here for shipping delivery times

Select ‘Standard Shipping – Auspost Only’ if you would prefer your parcel is sent with Auspost. Otherwise it will be shipped with any of our available carriers. Auspost Only shipping is not available on some very heavy/bulky orders.

Express Shipping (AU/NZ) – Need it faster? Express Shipping is available for $15. Express Shipping is not available on heavy/bulky orders. Orders placed before midday on business days are usually dispatched same day (otherwise within 1 business day). Delivery times in the table below.

Click and Collect – Shop online and collect in our Milton, Brisbane store, free for all orders. Orders are usually ready within 2 hours (during opening hours). Click here for address and opening hours.

Terms and conditions apply, click here for a full overview of our shipping policies

Manufacturing defects covered, replaced or repaired if soon after purchase.

  • If you have selected the wrong product/size for you, or want to exchange/return for any reason except for warranty or our error, this is referred to as a 'change of mind' return.
  • Not all products are eligible for change of mind returns (click here for excluded products).
  • Once you submit a Return Request, we will provide return instructions via email (along with a prepaid return label if applicable). Please wait to receive this before returning any items (Try 2 Anything excluded)
  • Change of mind returns can be resolved by your choice of exchange, full store credit, or a refund. Refunds are subject to a $19.95 admin fee.

For a full overview of our returns and warranty policies, see Returns and Warranties

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