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Regular, duck down sleeping bag with a semi-rectangular shape and 650+ fill power. Ideal for camping, travelling, and backpacking in various conditions.
Regular, duck down sleeping bag with a semi-rectangular shape and 650+ fill power. Ideal for camping, travelling, and backpacking in various conditions.
Sea to Summit

Sea to Summit Circuit Down -9C/15F Regular Sleeping Bag Dark Blue

£325.00
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Pre-Order

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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90-day returns period

DPD Returns Portal
We hope that you are perfectly happy with your order from Trekitt, but we understand that sometimes you may need to return an item. We offer a 90-day returns period from the date of purchase and aim to process all returns within 48 working hours of receipt. During exceptionally busy periods, returns may take up to 7 working days to be processed.

We do not offer a free returns service. If using the DPD Returns Portal, a charge of £5 will be deducted from your refund when processed. Returns from Highlands and Islands using theDPD Returns Portalwill deduct £15.50 from the order refund. Large DPD returns will have £6 deducted from their refund. (Specifications are over 5kg, and over Length of 30cm x width of 30cm and height of 10cm). If customers are returning items using their own postal service, and our returns form, all customers are responsible for any postage costs when returning any goods (excluding warranty returns).
For your convenience, follow here to theDPD Returns Portalto submit a return or click the button below. Alternatively, to arrange return postage for your items. Please use our warehouse returns address (Returns, Unit H&J, Moreton Business Park, Hereford, HR4 8DS) when completing the Returns PDF form below.


We are not liable for delays once an order has been dispatched. However, we will always work with the courier to assist in resolving any delivery issues where possible.
If an order has not been received, customers must contact us within 14 days ofdispatchso that we can investigate and assist accordingly.

If you have returned an item using the DPD returns portal and have not received confirmation of your refund, you must contact us within 14 days of dispatching your return so we can investigate. After this period, we may be unable to investigate or raise a claim.
We do not offer a free returns service. Customers returning items using their own postal service and our returns form are responsible for any postage costs when returning goods (excluding warranty returns).
To arrange your return, please complete the Returns PDF form and send you item to our warehouse at:
Returns
Unit H&J, Moreton Business Park
Hereford
HR4 8DS
Thank you for your patience while we improve our returns service.



The Trekitt Returns Policy Includes...
A 90 day return period and the Trekitt 2-year Common Sense Guarantee.

Exemptions & Surcharges
PPE (Facemasks, Climbing Equipment etc. ), Food Goods, Accessory Cord, Socks & Underwear can only be returned if they have not been worn and/or removed from their original packaging with all swing tags still attached. If there is any sign or possibility that the goods have been used, tampered with or contaminated in any way, then we cannot accept a return on the grounds of consumer safety. Zips are typically not covered under a manufacturer's warranty.

Please take care when packaging your returning order as customers will be liable for any exceptions or surcharges incurred for incorrectly packaged returns. You will be informed via email of the value of the charges which will be deducted form your refund amount.

The above does not affect the Consumer Contract Regulations. Click here to read more.

I want to return/exchange an online order
I want to return an unwanted item I want to return a faulty item under warranty I want to Exchange an item
Post it back to us Bring it back to us

To return an item to us, you must first:

  • Ensure the item is unused and in its original condition (including all label, tags and Boxes) and in a resellable condition
  • To arrange return postage for your items. Please use our warehouse returns address (Returns, Unit H&J, Moreton Business Park, Hereford, HR4 8DS) when completing the Returns PDF form here.
  • Appropriately package your item in protective packaging, failure to do so will invalidate your rights to a full refund or return (including footwear boxes which can be damaged in transit/customer care if not protected)
  • Please take care when packaging your returning order as customers will be liable for any exceptions or surcharges incurred for incorrectly packaged returns. You will be informed via email of the value of the charges which will be deducted form your refund amount.

Trekitt Returns,
Unit H-J,
Moreton Business Park,
Hereford,
HR4 8DS

Please ensure the service you use corresponds to the size/weight/value of the item. We regret to inform you that we cannot be held responsible for returned goods that become lost or damaged in transit. We therefore strongly recommend that you use a recorded/insured delivery service and keep a record of this and track your item. Once it has arrived at our warehouse, please wait the advised 48 hours for your refund which you will be notified of with a refund receipt sent to your account email. If you have not heard anything after this then please reach out to our Customer Support Team [email protected].

You can also return internet purchases at the Trekitt Service Centre in Hereford. To speed things along, please bring the Sales Invoice we sent via email as proof of purchase.

If you choose to receive a refund, this will be processed separately by our Customer Support Team.

You may exchange product(s) at the shop for Goods of an equal or higher value for which you will receive a new receipt.

Please note:
PPE (Facemasks, Climbing Equipment), Food Goods, Socks & Underwear can only be returned if everything is exactly as it was received. Packaging and labelling must be intact, and underwear must be unworn. If there is any sign or possibility that the goods have been used, tampered with, or contaminated in any way then we regret that we are unable to accept a return on the grounds of consumer safety.

This does not affect Consumer Contract Regulations.

Post it back to us Bring it back to us

If you feel that your item is defective/broken/faulty and it is still under warranty, please contact our Customer Support team ([email protected]) with as much information as possible with regards to the fault, including photos if applicable.

In return, they will supply you with a Returns Authorisation Number (RAN), a Returns Form and a FREE postage label. Please complete the returns form with as much detail as possible and include it with your item.

Download our Returns Form.

Trekitt Returns,
Unit H-J,
Moreton Business Park,
Hereford,
HR4 8DS

We cannot make any decisions before inspecting any claim. Should the item be found genuinely faulty, we aim to reach a fair and agreed solution, which may be a refund, a replacement or a professional repair.

Please note: We may need to send items to the original supplier, or a fully certified testing company. This process can take up to four weeks or longer during busy periods.

THIS BIT IS IMPORTANT! - To ensure your Warranty Return goes smoothly, please ensure all items are in a clean, dry condition and free from dirt. Any items that do not meet the above criteria will be sent back to you for health and hygiene purposes or you may be contacted asking if you would like us to clean it for you, where a cleaning charge will be applied with a minimum charge of £25.00.

Failure to follow the Warranty Returns procedure may significantly affect our ability to process your return and cause a delay in issuing your refund/replacement/repair.

You can also return internet purchases at the Trekitt Service Centre in Hereford. To speed things along, please bring the Sales Invoice we sent via email as proof of purchase.

If you choose to receive a refund, this will be processed separately by our Customer Support Team.

You may exchange product(s) at the shop for Goods of an equal or higher value for which you will receive a new receipt.

Online Bring it back to us

We do not offer exchanges. Instead we ask you kindly to complete a new order for the desired replacement and return the unwanted Good(s) for a refund. We acknowledge that this might seem more complicated, we can assure you it is by far the most efficient and fastest way to ensure that you receive the goods you require.

Any returns sent back requesting an exchange will be refunded in line with our returns process.

You can exchange internet purchases at the Trekitt Service Centre in Hereford, to speed things along please remember to present the sales invoice supplied by us in respect of such Goods as proof of purchase. You may exchange product(s) at the shop for Goods of an equal or higher value for which you will receive a new receipt.

Book an appointment
When will I receive my refund?
I paid by card I paid using PayPal

Once our Returns Team has processed your refund, you will receive a new e-receipt showing the returned item(s). After this you should expect to see your funds back in your account within 3 to 5 working days, depending on how your card provider processes refunds.

Refunds can only be made to the original payment method and are normally processed within 2 working days, however, during busy periods they can take up to 7 days.

Once our Returns Team has processed your refund, you will receive a new e-receipt showing the returned item(s). After this you should expect to see your funds back in your PayPal account that same day.

Refunds can only be made to the original payment method and are normally processed within 48 hours, however, during busy periods they can take up to 7 days.

What is the Trekitt 2-year Common Sense Guarantee?

We love this business and take great care personally selecting the products we sell. We are confident that the kit we have chosen is the best currently available.

That is why we offer our Trekitt Common Sense 2-year guarantee on every product we sell!

Therefore, if within 2-years a manufacturing fault develops in the materials or construction of a product that we have sold you, we guarantee to sort it out. We aim to reach a fair and agreed solution, which may be a refund, replacement or a professional repair.

The "common sense" bit. Please don't send us kit that has been used and abused and is completely worn out, and then expect us to replace it. Stuff does wear out, it's a fact of life, however if you feel that your purchase is genuinely faulty please get in touch with us at [email protected]

Please note:
PPE (Facemasks, Climbing Equipment), Food Goods, Socks & Underwear can only be returned if everything is exactly as it was received. Packaging and labelling must be intact, and underwear must be unworn. If there is any sign or possibility that the goods have been used, tampered with, or contaminated in any way then we regret that we are unable to accept a return on the grounds of consumer safety.

This does not affect Consumer Contract Regulations.

What does "90 Day Returns Period" mean?

We offer an 90 Day returns period provided the items are returned in the original condition that you received them, including all labels and packaging intact.

Please note:
PPE (Facemasks, Climbing Equipment), Food Goods, Socks & Underwear can only be returned if everything is exactly as it was received. Packaging and labelling must be intact, and underwear must be unworn. If there is any sign or possibility that the goods have been used, tampered with, or contaminated in any way then we regret that we are unable to accept a return on the grounds of consumer safety.

This does not affect Consumer Contract Regulations.

Consumer Contract Regulations (CCR)

What are the Consumer Contract Regulations?

Under the "Consumer Contract Regulations, you have the right to cancel an order for goods made at a distance. These rights start from the moment you place your order and ends 14 days from the day you receive your goods.

Your right to cancel

Your right to cancel an order for goods starts the moment you place your order and ends 14 days from the day you receive your goods.

This 14 day period is the time you have to decide whether to cancel, you then have a further 14 days to actually send the goods back.

Your Right to a Refund under CCR

You may get a refund within 14 days of either, the trader getting the goods back, or you providing evidence of having returned the goods (for example, a proof of postage receipt from the post office), whichever is the sooner.

A deduction can be made if the value of the goods has been reduced as a result of you handling the goods more than was necessary. The extent to which you can handle the goods is the same as it would be if you were assessing them in a shop.

Refunding the cost of delivery

The trader has to refund the basic delivery cost of getting the goods to you in the first place, so if you opted for enhanced service e.g. guaranteed next day, it only has to refund the basic cost.

Exemptions

There are some circumstances where the Consumer Contracts Regulations does not give you a right to cancel. These include CDs, DVDs or software if you've broken the seal on the wrapping, perishable items and tailor-made or personalised items. They also include goods with a seal for health protection and hygiene reasons that have been broken or tampered with, e.g. Climbing Equipment and PPE.

My goods are broken

If you feel that your item is defective/broken/faulty and it is still under warranty, please contact our Customer Support team([email protected])with as much information as possible with regards to the fault, including photos if applicable.

We want to reduce our impact on the environment as much as possible, the first step for this is reducing our waste. Therefore, please note that we will always offer a professional repair in the first instance; if the product can be repaired.

This may involve your product being sent back to our suppliers or to a professional repair company. Please note that due tovaried procedures, warranty claims and repairs can take between 2 and 4 weeks to be concluded

Consumer Contract Regulations (CCR)

What are the Consumer Contract Regulations?

Under the "Consumer Contract Regulations, you have the right to cancel an order for goods made at a distance. These rights start from the moment you place your order and ends 14 days from the day you receive your goods.

Your right to cancel

Your right to cancel an order for goods starts the moment you place your order and ends 14 days from the day you receive your goods.

This 14 day period is the time you have to decide whether to cancel, you then have a further 14 days to actually send the goods back.

Your Right to a Refund under CCR

You may get a refund within 14 days of either, the trader getting the goods back, or you providing evidence of having returned the goods (for example, a proof of postage receipt from the post office), whichever is the sooner.

A deduction can be made if the value of the goods has been reduced as a result of you handling the goods more than was necessary. The extent to which you can handle the goods is the same as it would be if you were assessing them in a shop.

Refunding the cost of delivery

The trader has to refund the basic delivery cost of getting the goods to you in the first place, so if you opted for enhanced service e.g. guaranteed next day, it only has to refund the basic cost.

Exemptions

There are some circumstances where the Consumer Contracts Regulations does not give you a right to cancel. These include CDs, DVDs or software if you've broken the seal on the wrapping, perishable items and tailor-made or personalised items. They also include goods with a seal for health protection and hygiene reasons that have been broken or tampered with, e.g. Climbing Equipment and PPE.

DPD Returns Portal

Sea to Summit Circuit Down -9C/15F Regular Sleeping Bag Dark Blue

Season:AW26

Brand:Sea to Summit

Code:101002

Sea to Summit Circuit Down Sleeping Bag -9C/15F Long
More Room to Move While You Sleep The Circuit is designed for campers who find traditional mummy sleeping bags too restrictive. Its semi-tapered rectangular shape provides noticeably more room around the hips, knees and feet, making it comfy for side sleepers and anyone who likes to change position throughout the night without sacrificing warmth.

Product Ratings

Weight
LightHeavy
Packsize
SmallLarge
Warmth
WarmExtremely Warm

We find this suitable for

Camping

Hiking

Backpacking

Sea to Summit Circuit Down Sleeping Bag -9C/15F Overview

The Sea to Summit Circuit Down Sleeping Bag is designed for adventurers who want the warmth and packability of a technical down sleeping bag combined with the comfort and versatility of a more spacious design. Its semi-tapered rectangular shape provides extra room to move, making it particularly well-suited to side sleepers and anyone who prefers a less restrictive fit during the night.

Filled with responsibly sourced 650+ fill power Ultra-Dry Duck Down, the Circuit delivers reliable insulation while maintaining excellent packability for camping, backpacking and travel adventures. The wrap-around zip system allows the bag to be fully ventilated on warmer nights or opened completely flat to function as a quilt when conditions permit.

Best For

  • Backpacking
  • Camping
  • Trekking
  • Travel adventures
  • Side sleepers
  • Multi-day hiking trips
  • Three-season camping
  • Lightweight overnight adventures

Materials

Recycled Polyester Shell & Lining

The Circuit uses lightweight 20D recycled polyester fabrics throughout the shell and lining to balance durability, breathability and packability.

The lightweight construction helps minimise overall weight while maintaining long-term durability for regular camping and backpacking use. The soft-touch brushed lining fabric enhances comfort against the skin and contributes to a more comfortable night's sleep.

650+ Fill Power Ultra-Dry Duck Down

The Circuit is insulated with 650+ fill power Ultra-Dry Duck Down, providing an excellent balance of warmth, compressibility and value.

The down is treated to improve moisture resistance and maintain loft in damp conditions, helping deliver reliable thermal performance during extended outdoor trips.

Responsible Down Standard (RDS)

The Circuit uses Responsible Down Standard (RDS) certified duck down, ensuring that the insulation comes from farms that meet strict animal welfare requirements. RDS certification verifies that the birds have not been subjected to unnecessary harm, including force-feeding or live-plucking practices, while also providing full traceability throughout the supply chain.

Recycled Storage & Compression Sacks

The included compression sack and storage cell are both manufactured from recycled nylon fabrics, supporting Sea to Summit's commitment to reducing environmental impact.

Features & Technologies

Spacious Semi-Rectangular Shape

The Circuit's semi-tapered rectangular design provides significantly more room than a traditional mummy sleeping bag.

This extra space allows greater freedom of movement throughout the night while still maintaining thermal efficiency, making it particularly appealing for side sleepers and those who prefer a less restrictive sleeping experience.

Quilt Conversion Design

A full wrap-around zip allows the Circuit to open completely flat and function as a quilt when temperatures rise.

This versatility allows the sleeping bag to adapt to a wider range of camping conditions while reducing the need for multiple sleep systems.

Precise Ventilation Control

The wrap-around zip system allows airflow to be adjusted throughout the bag, including opening the footbox independently for targeted cooling.

This makes it easier to regulate sleeping temperature during changing overnight conditions.

Hybrid Box-Baffle Construction

The Circuit uses a hybrid box-baffle construction designed to minimise down migration throughout the bag.

By keeping insulation evenly distributed, the system helps eliminate cold spots and maintain consistent warmth throughout the night.

Draft Collar & Draft Tubes

A shaped draft collar and continuous down-filled draft tubes help minimise heat loss around key areas of the sleeping bag.

This design improves thermal efficiency by helping retain warmth when temperatures drop.

YKK Anti-Snag Zip System

The high-quality YKK #5 coil zipper incorporates an anti-snag plough designed to reduce fabric snagging during use.

This improves reliability and makes entering, exiting and ventilating the sleeping bag easier and more convenient.

Lightweight Packability

The combination of 650+ fill power down insulation and lightweight recycled fabrics allows the Circuit to compress efficiently into the supplied compression sack.

This helps minimise pack space during backpacking, trekking and travel adventures.

Features Summary

  • Regular length sleeping bag
  • ISO-tested temperature performance
  • Semi-tapered rectangular shape
  • 650+ fill power Ultra-Dry Duck Down insulation
  • RDS-certified duck down
  • Full quilt-opening design
  • Wrap-around ventilation zip
  • Footbox ventilation options
  • Hybrid box-baffle construction
  • Shaped draft collar
  • Continuous down-filled draft tubes
  • Lightweight 20D recycled polyester shell
  • Soft-touch recycled polyester lining
  • YKK #5 anti-snag zipper
  • Compression sack included
  • Storage sack included
  • Recycled materials throughout
  • Non-PFAS construction

Explore More Sleeping Bags

If you're building a complete camping sleep system, it may also be worth exploring our wider range of sleeping bags, sleeping mats, tents and camping accessories.

You can also visit our Sleeping Bags Knowledge Centre for expert advice and top Trekitt gear recommendations.

Explore More Sleeping Bags

If you're building a complete camping sleep system, it may also be worth exploring our wider range of sleeping bags, sleeping mats, tents and camping accessories.

You can also visit our Sleeping Bags Knowledge Centre for expert advice and top Trekitt gear recommendations.

Sea to Summit Circuit Down Sleeping Bag Trekitt review
Trekitt Review The Circuit sits in a really useful middle ground. It feels noticeably roomier than most performance-focused sleeping bags, yet still packs down surprisingly well for a down-filled bag rated to -9°C. If you want warmth without feeling cocooned inside a tight mummy bag, this is one of the more comfortable options we’ve come across.
Sea to Summit Circuit Down Sleeping Bag warmth rating
Warm Enough for UK Three-Season Camping? Yes. The 650+ fill power Ultra-Dry Duck Down, shaped draft collar and down-filled draft tubes make the Circuit a strong choice for spring, autumn and cooler summer nights in the UK. Many campers will also find it suitable for milder winter conditions when paired with the right sleeping mat.
Sea to Summit Circuit Down Sleeping Bag pack size
How Well Does It Pack Down? Despite its generous shape and comfort-focused design, the Circuit compresses well for backpacking and travel. The included compression sack helps reduce bulk in your pack, making it easier to carry on multi-day hikes, camping trips and adventure travel.




Building a comfortable camping sleep system? Explore our full range of sleeping bags, mats and camping essentials for backpacking, trekking and travel adventures.🏕️Browse sleeping bags


FAQ

Is the Sea to Summit Circuit -9°C suitable for UK camping?

Yes. It is a strong option for cooler UK camping trips, especially in spring, autumn and colder summer conditions when paired with a suitable sleeping mat.

Is a down sleeping bag better than a synthetic sleeping bag?

For most campers and backpackers, down offers a better warmth-to-weight ratio and packs down much smaller than synthetic insulation. That's why down sleeping bags like the Circuit are often preferred for trekking, backpacking and travel where saving pack space matters.

Is the down responsibly sourced?

Yes. The Circuit uses RDS-certified duck down, meaning the insulation is sourced to recognised animal welfare and traceability standards.

Does Ultra-Dry Down help in damp conditions?

Yes. Ultra-Dry Down is treated to resist moisture better than untreated down, helping maintain loft and warmth more reliably in damp camping conditions.

Does it come with a compression sack?

Yes. A compression sack is included, along with a storage sack for keeping the sleeping bag properly lofted when not in use.

Is it suitable for backpacking?

Yes. Although it is roomier than a narrow mummy bag, the down insulation and included compression sack make it practical for backpacking and multi-day trips.

Why is the sleeping mat important with this bag?

A sleeping bag’s warmth depends heavily on the mat underneath. For colder nights, pairing the Circuit with an insulated sleeping mat will help prevent heat loss to the ground.

Technical Information

Specification

Details

Temperature Rating

-9°C / 15°F

Length

Regular 207cm

Max User Height

185cm

Weight

1290g

Compresses down to

9.7L

Shape

Semi-Tapered Rectangular

Insulation

650+ Fill Power Ultra-Dry Duck Down

Down Certification

RDS Certified

Shell Fabric

100% Recycled Polyester

Lining Fabric

100% Recycled Polyester

Compression Sack

Included

Storage Sack

Included

Zip Type

Full Wrap-Around YKK #5 Coil Zip

Quilt Conversion

Yes

Ventilation Footbox

Yes

Recycled Materials

Yes

PFAS Free

Yes

Sizing Information
Professional Opinion
Product Reviews
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