Sea to Summit Circuit −1°C Regular sleeping bag in Dark Blue
Sea to Summit Circuit −1°C Long sleeping bag in Dark Blue
Sea to Summit Circuit −1°C Regular: 207 cm bag length, sleeper height up to 185 cm
Sea to Summit Circuit −1°C Long: 222 cm bag length, sleeper height up to 198 cm
Sea to Summit Circuit −1°C Regular compressed volume: 5.4 litres
Sea to Summit Circuit −1°C Long compressed volume: 6 litres
Sea to Summit Circuit −1°C Regular packed size shown in hand
Sea to Summit Circuit sleeping bag hood and roomy fit
Sea to Summit Circuit sleeping bag footbox opened for ventilation
Sea to Summit Circuit internal zipped pocket with a phone inside
Sea to Summit Circuit −1°C Short sleeping bag in Dark Blue
Sea to Summit Circuit −1°C Short: 192 cm bag length, sleeper height up to 170 cm
Sea to Summit Circuit −1°C Short compressed volume: 5.1 litres
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Sea to Summit Circuit −1°C Regular sleeping bag in Dark Blue
Sea to Summit Circuit −1°C Long sleeping bag in Dark Blue
Sea to Summit Circuit −1°C Regular: 207 cm bag length, sleeper height up to 185 cm
Sea to Summit Circuit −1°C Long: 222 cm bag length, sleeper height up to 198 cm
Sea to Summit Circuit −1°C Regular compressed volume: 5.4 litres
Sea to Summit Circuit −1°C Long compressed volume: 6 litres
Sea to Summit Circuit −1°C Regular packed size shown in hand
Sea to Summit Circuit sleeping bag hood and roomy fit
Sea to Summit Circuit sleeping bag footbox opened for ventilation
Sea to Summit Circuit internal zipped pocket with a phone inside
Sea to Summit Circuit −1°C Short sleeping bag in Dark Blue
Sea to Summit Circuit −1°C Short: 192 cm bag length, sleeper height up to 170 cm
Sea to Summit Circuit −1°C Short compressed volume: 5.1 litres

Sea To Summit Roomy down sleeping bags

Sea to Summit Circuit Down Sleeping Bag −1°C

Room to turn. Less bulk to carry.

  • Room to turn: a semi-tapered rectangular shape and brushed lining
  • +2°C comfort / −1°C lower limit, with 650+ fill power down
  • Wraparound zip: vent your feet or open flat as a quilt
$619.99 SALE PRICE 0% OFF
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Terms & fees

Includes a $55 establishment fee and $65 annual fee ($32.50 half-yearly). Standard interest rate (currently 29.49% p.a.) applies after the Interest Free term ends. *Paying only the minimum monthly repayment of 3% of the outstanding monthly balance or $20 (whichever is more) may not be sufficient to repay the purchase amount(s) during the Interest Free term. Further information on rates and fees is available at gemfinance.co.nz. Credit provided by Latitude Financial Services Limited.

Size
NZ deliveryTarget 1–2 business days* 30-day returns Returns & exchanges Support & FAQs Delivery & warranty
+2°CISO comfort
−1°CISO lower limit
820 gRegular bag weight
5.4 LRegular compressed volume

Sea to Summit Circuit

Room to turn. Less bulk to carry.

For milder nights when a compact down bag and room to move matter. The Circuit combines a roomy semi-tapered rectangular shape with 650+ fill power Ultra-Dry duck down. Open the wraparound zip to vent your feet or lay the bag flat as a quilt.

Sea to Summit Circuit sleeping bag hood and roomy fit

Room to sleep your way.

The semi-tapered rectangular shape gives you room to turn and sleep on your side. A soft brushed lining makes it comfortable against your skin.

Sea to Summit Circuit sleeping bag footbox opened for ventilation

Zip up, vent, or open flat.

The full-length wraparound zip lets you open the footbox for airflow. Unzip completely to use Circuit as a flat quilt on warmer nights.

Sea to Summit Circuit −1°C Regular compressed volume: 5.4 litres

Pack it for the next overnight.

650+ fill power Ultra-Dry duck down compresses into the supplied sack. This −1°C model packs to 5.1 L in Short, 5.4 L in Regular or 6 L in Long.

Warmth & fit

Choose warmth. Then choose your size.

This −1°C model has a +2°C ISO comfort rating. Start with comfort if you sleep cold and allow a margin for your conditions. Recommended sleeper heights: Short up to 170 cm, Regular up to 185 cm and Long up to 198 cm. Long adds 5 cm of width. The bag lengths below are overall dimensions, not sleeper heights.

DetailShortRegularLong
Sleeper heightUp to 170 cmUp to 185 cmUp to 198 cm
Bag weight770 g820 g910 g
Packed weight900 g950 g1040 g
Down fill weight384 g411 g469 g
Compressed volume5.1 L5.4 L6 L
Bag length × width192 × 72.5 cm207 × 72.5 cm222 × 77.5 cm
Packed dimensions41 × 22.5 × 15.5 cm41 × 22.5 × 15.5 cm41 × 22.5 × 15.5 cm

Specifications

All the details, in one place.

Comfort rating
+2°C
Lower-limit rating
−1°C
Rating standard
ISO 23537
Insulation
650+ fill power RDS-certified Ultra-Dry duck down
Shell & lining
20D recycled polyester; brushed liner
Shape
Semi-tapered rectangular
Zip
Left-hand full-length wraparound YKK #5
Colour
Dark Blue
Short / Regular / Long weight
770 g / 820 g / 910 g
Short / Regular / Long compressed volume
5.1 L / 5.4 L / 6 L

Compare your options

Which Circuit is right for you?

Sea to Summit Circuit −1°C Regular sleeping bag in Dark Blue

Circuit −1°C · this model

+2°C comfort / −1°C lower limit. Regular 820 g; 5.4 L compressed.

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Sea to Summit Circuit −9°C Regular sleeping bag in Dark Blue

Circuit −9°C

−5°C comfort / −9°C lower limit. Regular 1160 g; 9.7 L compressed.

View product →

FAQs

A few helpful answers.

The details to help you choose with confidence.

Does −1°C mean I will be comfortable at that temperature?

The model name uses the ISO lower limit: −1°C. Its ISO comfort rating is +2°C. Start with comfort if you sleep cold, and allow a margin for the nights you expect. Ratings are laboratory comparisons, not a guarantee for every sleeper. An insulated mat, shelter and clothing also affect warmth.

Should I choose Short, Regular or Long?

Short is recommended for sleepers up to 170 cm, Regular up to 185 cm and Long up to 198 cm. Short and Regular are 72.5 cm wide; Long adds 5 cm of width. These are recommended sleeper heights; 192 cm, 207 cm and 222 cm are the overall bag lengths. Choose a fit that leaves room at your feet without pressing the insulation flat.

How is the −1°C different from the −9°C?

Both have the same roomy shape, 650+ fill power down and wraparound zip. The −1°C has a +2°C comfort rating and weighs 820 g in Regular. The −9°C has a −5°C comfort rating and weighs 1160 g in Regular. Choose −9°C for the colder comfort rating, allowing for its greater weight and packed volume.

Can it open flat or zip to another sleeping bag?

It opens fully flat as a quilt. You can also open the footbox while keeping the upper section zipped. Circuit bags cannot zip together or couple with other Sea to Summit bags; this model has a left-hand wraparound zip.

Is it waterproof?

No. Ultra-Dry Down and the water-repellent shell help manage moisture, but the bag is not waterproof. Keep it protected from rain and water in your pack and use suitable shelter.

Is there a women’s version?

Circuit is a unisex range. Use the comfort rating as your starting point if you sleep cold: +2°C for this model. Choose Short, Regular or Long by your height and the room you need.

What is included, and how should I store it?

The sleeping bag includes a compression sack for transport and a storage cell for keeping it loose between trips. Air it after use, let it dry completely and store it uncompressed. Follow Sea to Summit’s care instructions for cleaning.

Sea to Summit Circuit Down Sleeping Bag −1°C

Choose your size

Frequently asked questions

Can I return or exchange my order?

Eligible items can be returned within 30 days of purchase, unused with original packaging and labels. There is no handling or restocking fee. Return postage is at your cost; conditions apply.

Returns policy
What if I need warranty or repair help?

Contact us before sending anything back, with your order details, photos and a brief description of the issue. We will help with warranty, repair or spare-part options. Coverage varies by product; your consumer rights still apply.

Get warranty help
How long will my order take to arrive?

Our target is 1–2 business days after dispatch for in-stock, standard parcels. Rural, remote and bulky deliveries can take longer. Preorders, public holidays and carrier delays may affect timing. Contact us if you need an item by a specific date.

Delivery information
How much does shipping cost?

Standard NZ shipping is $10, or free on orders over $150, excluding large items. Product-specific freight or remote-area surcharges may apply. Final shipping charges are shown at checkout.

Delivery information
Will I receive tracking details?

Yes, tracking details are sent by email when your order is dispatched. Allow time for the carrier’s first scan. If you cannot find the email, contact us with your order number.

Contact our team

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