Highlights
BEST USE: All outdoor activities
PERFORMANCE: 2 Season
WEIGHT: 1lb 10.8oz | 760g
COMPRESSED VOLUME: 4.6 liters
Shipping & Returns
Free standard delivery in Australia for orders over $49.99*.
For all other orders under $49.99, we charge a flat fee of $10.00 for standard delivery in Australia. We do not ship to an address outside of Australia.
The standard delivery time is 10 Business Days depending on your location. For more details, check out our Shipping Policy.
If you are not entirely satisfied with your order, you may be entitled to a refund of the purchase price of the Product. For more details, please check out our Refund Policy.
Find Locally
The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.
A unisex sleeping bag with a Lower limit of 14ºF means a man should be comfortable down to air temperatures of 14ºF. The same bag will also have a Comfort limit, in the realm of 27°F, so a woman would be comfortable down to an air temperature of 27ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.
A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.
Description
The Trek down sleeping bag brings the comfort of a tapered-rectangular mummy shape and the versatility of a dual-zip ventilation system to wherever your travels may take you. The full-length side zipper and secondary foot box zipper allow you to increase ventilation or open the Trek completely flat like a comforter, and the quality down will keep you warm and snug on chilly nights.
The broader mummy cut gives you room to move inside the bag, regardless of your sleeping position. A Regular Wide model is available for those who really appreciate the extra wiggle room.
Light and compact, the Trek might just become your favourite trekking / backpacking / travel / camping / down sleeping bag.
Tech specs
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Best UseAll outdoor activities
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Comes WithUltra-Sil Compression Sack & Storage Cube
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InsulationUltra-Dry Down 650+ Loft
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ShapeRelaxed Mummy
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Shell Fabric30D Nylon Shell
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Zip OptionsFull length left side and foot box zipper. Unzip fully to use as quilt or comforter. See ‘Features’ for bags which can be coupled to the Trek.
| Trek I (-1°C) Regular | Trek I (-1°C) Regular Wide | Trek I (-1°C) Long | Trek II (-8°C) Regular | Trek II (-8°C) Regular Wide | Trek II (-8°C) Long | Trek III (-12°C) Regular | Trek III (-12°C) Long |
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TECHNICAL FEATURES
The second highest-lofting down used in any of Sea to Summit’s sleeping bags or quilts. 650+ Fill Power indicates that one ounce (30g) of down will re-expand to over 650 cubic inches after compression. Higher loft means that less down can be used to achieve the same temperature rating – important for performance sleeping bags. The loft and down quality/composition are independently tested by the International Down and Feather Laboratory (IDFL) – a copy of the certification is supplied with every Sea to Summit sleeping bag. The down is responsibly sourced and RDS certified and treated with our non-PFC Ultra-Dry Down™ treatment.
100% of the down used in our sleeping bags and quilts is independently certified to the Responsible Down Standard (RDS). The RDS certifies down against animal welfare requirements and tracks it from the source to the final product. The purchase of RDS certified products demonstrates demand for better animal welfare practices in the down and feather supply chain. Sea to Summit is certified to the RDS. To learn more about RDS visit
Down and synthetic bags identified with our zip coupling symbol use a 65 inch #5 YKK full-length zip which allows a unisex left-handed and women's specific right-handed bag to pair together. Designed to pair side by side, each person sleeps in their own bag enabling each of you to take advantage of your bag's unique insulation zones, hood and footbox features - perfect for cozy adventures for two. Bags with full-length #5 YKK zips on both sides can also be coupled together with other pairing bags.
Sea to Summit hydrophobic down and DWR finishes are Non-PFC.
UltraDry Down:
The down is RDS-certified responsibly sourced. The non-PFC Ultra-Dry Down™ hydrophobic treatment means it absorbs less water than untreated down and dries much more quickly. Ultra-Dry Down does not affect the loft or lifespan of the down, or its breathability. The treatment will last through at least 20 washings
Non-PFC DWR Shell fabric:
Despite being incredibly lightweight, the 10 Denier UL Nylon is down-proof and surprisingly durable. A non-PFC DWR finish helps the shell to shed external moisture. This fabric is part of the secret to making the Spark and Flame Down Sleeping Bags and the Ember Quilt Series some of the lightest, most packable sleep system products available today.
Design Details
Frequently Asked questions
Warm enough for cool weather camping or travel?
Yes. The quality down and 3D hood keeps you warm when the mercury drops. For colder-weather use, you would probably choose the Trek -12°C which has a draft collar and pair it with a greater than 3.5 R-Value sleeping mat like the Comfort Light Insulated.
Suitable for summer temperatures?
Yes. A full-length side zipper and a secondary foot box zipper can be opened for ventilation or to turn the Trek into a fully-flat comforter in really warm weather.
Able to be zipped to another sleeping bag?
Yes. The main side zipper can be zipped to Sea to Summit Altitude, Journey or Venture sleeping bags. The Trek Regular and Long bags have the same side zipper length.
