Last updated at 08/06/2026 18:41:00
Trek Tk1 Sleeping Bag (5 °C)
Free 60-day returns
Trek Tk2 Sleeping Bag (-1 °C)
Free 60-day returns
Sea to Summit Trek Tk III
Delivery $46.15
Sea To Summit Trek Tk I Sleeping Bag Blue Regular / Left Zipper Men
Delivery $29.99
Sea to Summit Trek TKI Down Sleeping Bag -1°C REGULAR / BLUE
Delivery between 11–18 June $35
originally posted on snowys.com.au
Great sleeping bag. Slept in it when is was 8 degrees outside and I was toasty warm.Make sure you get a good sleeping mat as that is half of your sleeping system!Packs down pretty small. About the size of a cauliflower (yes, random comparison but best size I could think of)
originally posted on seatosummitusa.com
I bought this sleeping bag last month for my trek (20days) in Iceland :1.After the first night i saw some down in my tent !!! i was looking at the bag and i could see the down going at several point near the zipper. I was very carefully do not jam the bag in the zip.The next days i coud see the down going away from other points...2.The inside material of the bag is really not comfortable and make you sweat directly. I used the bag just as blanket but i was still sweating inside with outside temperature of 5°C. This should not happend for sleeping bag rated as comfort zone -1°C...3.Everyday when i unpacked the bag it was still wet from the sweating, the down is then really affected. So i have also doubt about this "ultra dry down pattern" from See to ... MoreI bought this sleeping bag last month for my trek (20days) in Iceland :1.After the first night i saw some down in my tent !!! i was looking at the bag and i could see the down going at several point near the zipper. I was very carefully do not jam the bag in the zip.The next days i coud see the down going away from other points...2.The inside material of the bag is really not comfortable and make you sweat directly. I used the bag just as blanket but i was still sweating inside with outside temperature of 5°C. This should not happend for sleeping bag rated as comfort zone -1°C...3.Everyday when i unpacked the bag it was still wet from the sweating, the down is then really affected. So i have also doubt about this "ultra dry down pattern" from See to summit.4.The zip system is really complicated, its take time to switch from a blanket to a sleeping bag, why not using one zipline with 2 zipper (on the same zippline) ?, you can get exactly the same result (oppening for the feet, oppening for body or fully oppen like blanket), it would be cheaper and lighter.5.I use the bag also at 0°C one night, this time i had to close it to keep me warm, still a bit of sweating but not cold at all, so i don't doubt of the Comfort Temperature rating -1°CI am a big fan of the see to summit product, i like the quality and the ingeniosity that they involved in it, thats why im really shoked of the quality of this product.I hope i will be refound with the waranty.Thanks in advance
originally posted on seatosummitusa.com
I purchased the Trek TKII while preparing for a fall trip to the Eastern Sierras. The compressibility, weight, and warmth were the deciding factors when I bought the bag and it DID NOT disappoint. With the compression sack provided with the bag I was able to get the bag down about the size of 3 standard Nalgene bottles. The warmth it provided was incredible, I was warm and cozy down to 15 degrees (3 below the comfort level) wearing nothing but a wool base layer. The outer shell proved to be durable and water resistant as well. The separate zipper at the feet allowed me to stay warm in the bag while I shuffled around camp preparing breakfast for my companions. Pair it with the ultralight insulated pad and you have the perfect 3+ season combo. It will be traveling ... MoreI purchased the Trek TKII while preparing for a fall trip to the Eastern Sierras. The compressibility, weight, and warmth were the deciding factors when I bought the bag and it DID NOT disappoint. With the compression sack provided with the bag I was able to get the bag down about the size of 3 standard Nalgene bottles. The warmth it provided was incredible, I was warm and cozy down to 15 degrees (3 below the comfort level) wearing nothing but a wool base layer. The outer shell proved to be durable and water resistant as well. The separate zipper at the feet allowed me to stay warm in the bag while I shuffled around camp preparing breakfast for my companions. Pair it with the ultralight insulated pad and you have the perfect 3+ season combo. It will be traveling with me to Arkansas on the Ozark Highlands Trail this winter and to Kyrgyzstan this spring on a bikepacking trip.I cannot wait to use this bag more, if I could give it 7 out of 5 stars I would.
| Snowys Comfort Rating | 5 °C |
| Lower Limit | −1 °C |
| Shape | Tapered Rectangular |
| Fill Ratio Top/Bottom | 60/40 |
| Max. User Height | 183 cm |
Trek Tk1 Sleeping Bag (5 °C)
Free 60-day returns
Trek Tk2 Sleeping Bag (-1 °C)
Free 60-day returns
Sea to Summit Trek Tk III
Delivery $46.15
Sea To Summit Trek Tk I Sleeping Bag Blue Regular / Left Zipper Men
Delivery $29.99
Sea to Summit Trek TKI Down Sleeping Bag -1°C REGULAR / BLUE
Delivery between 11–18 June $35
Great sleeping bag. Slept in it when is was 8 degrees outside and I was toasty warm.Make sure you get a good sleeping mat as that is half of your sleeping system!Packs down pretty small. About the size of a cauliflower (yes, random comparison but best size I could think of)
I bought this sleeping bag last month for my trek (20days) in Iceland :1.After the first night i saw some down in my tent !!! i was looking at the bag and i could see the down going at several point near the zipper. I was very carefully do not jam the bag in the zip.The next days i coud see the down going away from other points...2.The inside material of the bag is really not comfortable and make you sweat directly. I used the bag just as blanket but i was still sweating inside with outside temperature of 5°C. This should not happend for sleeping bag rated as comfort zone -1°C...3.Everyday when i unpacked the bag it was still wet from the sweating, the down is then really affected. So i have also doubt about this "ultra dry down pattern" from See to ... MoreI bought this sleeping bag last month for my trek (20days) in Iceland :1.After the first night i saw some down in my tent !!! i was looking at the bag and i could see the down going at several point near the zipper. I was very carefully do not jam the bag in the zip.The next days i coud see the down going away from other points...2.The inside material of the bag is really not comfortable and make you sweat directly. I used the bag just as blanket but i was still sweating inside with outside temperature of 5°C. This should not happend for sleeping bag rated as comfort zone -1°C...3.Everyday when i unpacked the bag it was still wet from the sweating, the down is then really affected. So i have also doubt about this "ultra dry down pattern" from See to summit.4.The zip system is really complicated, its take time to switch from a blanket to a sleeping bag, why not using one zipline with 2 zipper (on the same zippline) ?, you can get exactly the same result (oppening for the feet, oppening for body or fully oppen like blanket), it would be cheaper and lighter.5.I use the bag also at 0°C one night, this time i had to close it to keep me warm, still a bit of sweating but not cold at all, so i don't doubt of the Comfort Temperature rating -1°CI am a big fan of the see to summit product, i like the quality and the ingeniosity that they involved in it, thats why im really shoked of the quality of this product.I hope i will be refound with the waranty.Thanks in advance
I purchased the Trek TKII while preparing for a fall trip to the Eastern Sierras. The compressibility, weight, and warmth were the deciding factors when I bought the bag and it DID NOT disappoint. With the compression sack provided with the bag I was able to get the bag down about the size of 3 standard Nalgene bottles. The warmth it provided was incredible, I was warm and cozy down to 15 degrees (3 below the comfort level) wearing nothing but a wool base layer. The outer shell proved to be durable and water resistant as well. The separate zipper at the feet allowed me to stay warm in the bag while I shuffled around camp preparing breakfast for my companions. Pair it with the ultralight insulated pad and you have the perfect 3+ season combo. It will be traveling ... MoreI purchased the Trek TKII while preparing for a fall trip to the Eastern Sierras. The compressibility, weight, and warmth were the deciding factors when I bought the bag and it DID NOT disappoint. With the compression sack provided with the bag I was able to get the bag down about the size of 3 standard Nalgene bottles. The warmth it provided was incredible, I was warm and cozy down to 15 degrees (3 below the comfort level) wearing nothing but a wool base layer. The outer shell proved to be durable and water resistant as well. The separate zipper at the feet allowed me to stay warm in the bag while I shuffled around camp preparing breakfast for my companions. Pair it with the ultralight insulated pad and you have the perfect 3+ season combo. It will be traveling with me to Arkansas on the Ozark Highlands Trail this winter and to Kyrgyzstan this spring on a bikepacking trip.I cannot wait to use this bag more, if I could give it 7 out of 5 stars I would.
Took this bag out along the Western Arthur's range in Tasmania for a 7 nighter. We got horrible weather. Rained for 5 days, snow, hailed, howling southerly winds with a wind chill of -10. This bag kept me (mostly) dry and (mostly) warm despite the horrendous conditions. Although I wasn't toasty, I was never dangerously cold either. Definitely pushed the limits of what it was capable of but my heart is still beating and I didn't loose any digits so it passed the test. Great sleeping bag.
I bought this for ski-in winter cabin trips (wood stove heated) and summer car, canoe n hike camping. After two ski trips I’m happy to say it was the perfect purchase and I’ll never sleep in a cramped mummy bag again! Super light and packs down to nothing. I’m 6’1” got the long and glad I did. Comfort temp rating is always subjective depending how you sleep - I’m lean n cool off at night - so at 40 degrees I was comfortable in long sleeve shirt n boxers. At 30 degrees the long John’s will come out. A bag is only as good as it’s zippers, they appeared well made and was pleased they didn’t bind when openening n closing. I will eventually buy another SeatoSummit cold weather bag👍
Plenty of warmth and comfort as a sleeping bag or just a quilt for hotter nights. Very light to carry and compression bag is very useful.Haven't really used the internal pocket, but the hood and the zips for your feet are great features, that I appreciated.Very happy with my purchase.
Really like this bag. Plenty of room and lightweight. Purchased the 18 degree bag and tested it in Alaska for a week of both dry cabins and tents. Temperatures varied from high 30s to mid 50s. I am cold natured and was a bit cool in the tent in the 30s despite wearing wool layers, but again I am always cold. The bag is comfortable and seems well made. I like having both the regular storage and compression sack for backpacking. My biggest complaint is that it is really smelly. I have not had down bags smell quite this much. Any suggestions on ways to de-funkify it would be appreciated!
This sleeping bag is compact and lightweight. The quality does not disappoint as everything from Sea to Summit. The materials inside and outside seems to be easy to clean. I took the bag with me in my 10 days trip and it performed as expected. I really satisfied with the purchase.
I was looking for a quality 3 season bag and settled on the Trek TK2 after trying the marmot sawtooth and mountain hardwear bishop pass. I really wish I never bothered with this sleeping bag, I had a suspicion that the seams wouldn't hold up and I was right. After 3 days of use the down has started escaping through a few seems in the hood, one seem in particular quite substantially. For me that is a huge disappointment from a company that I expected a quality product from. Some additional dislikes, the zipper snags a lot more than the other models I tested, and the draft tubes are a little underwhelming. I wish this bag had a vaulted footbox but I can live without that. The bag is comfortable, more roomy than the bags I mentioned above, and the materials feel nice ... MoreI was looking for a quality 3 season bag and settled on the Trek TK2 after trying the marmot sawtooth and mountain hardwear bishop pass. I really wish I never bothered with this sleeping bag, I had a suspicion that the seams wouldn't hold up and I was right. After 3 days of use the down has started escaping through a few seems in the hood, one seem in particular quite substantially. For me that is a huge disappointment from a company that I expected a quality product from. Some additional dislikes, the zipper snags a lot more than the other models I tested, and the draft tubes are a little underwhelming. I wish this bag had a vaulted footbox but I can live without that. The bag is comfortable, more roomy than the bags I mentioned above, and the materials feel nice on the skin. It is also quite warm and has a good aesthetic, but the lack of quality is my main reason for a low rating. Hoping customer service comes through and provides a solution. I simply wish I could return it at this point.
I purchased the Sea to Summit TrekII -8 a few months ago and have been on a 9 day kayak trip and multiple multi-day backpacking trips with it. First off, I loved the shape and idea of this bag and after a long while researching and comparing it to others, bought it! Loved the bag when I received it for these reasons:- love the way it opens to a quilt, this is amazing for warm summer nights- colour and shape of great- seemed well built with a good amount of down (no gaps observed when held up to light)- stuff sack and storage sack are greatAfter using this bag well for the season, it was time to wash it. I have had many down sleeping bags over the years and have always followed the instructions and used the correct products to wash and dry. I am extremely ... MoreI purchased the Sea to Summit TrekII -8 a few months ago and have been on a 9 day kayak trip and multiple multi-day backpacking trips with it. First off, I loved the shape and idea of this bag and after a long while researching and comparing it to others, bought it! Loved the bag when I received it for these reasons:- love the way it opens to a quilt, this is amazing for warm summer nights- colour and shape of great- seemed well built with a good amount of down (no gaps observed when held up to light)- stuff sack and storage sack are greatAfter using this bag well for the season, it was time to wash it. I have had many down sleeping bags over the years and have always followed the instructions and used the correct products to wash and dry. I am extremely disappointed that after multiple attempts, I cannot get the down to unclump in a number of key areas. This includes around the hood, the draft tube and around the foot box. Like I said, I have tried a number of times to remedy this, especially with tennis balls and even bought a Granger kit with included dryer balls. Nothing has worked. I have taken the bag since then on a multi-day trip where it was only 6 degrees over night and suffered notable cold spots in all of these places. The trip was unfortunately not very enjoyable due to this and I am thinking I will require a new bag going forward.I love Sea to Summit products, but this experience really sucks considering my expectations for this product. If anyone from the company would like to reach out, I would be happy to provide more info if there is a deficiency to address.
| Snowys Comfort Rating | 5 °C |
| Lower Limit | −1 °C |
| Shape | Tapered Rectangular |
| Fill Ratio Top/Bottom | 60/40 |
| Max. User Height | 183 cm |
Sea to Summit Trek Down Sleeping Bag TKI Regular
Sea to Summit Trek TkI Down sleeping bag (Regular, blue) - Regardless of whether you’re staying in a hostel or sleeping in a tent, the Trek TkI down sleeping bag from Sea to Summit will keep you comfortable! The lightweight and packable sleeping bag boasts a tough outer shell and down insulation for optimal warmth. The down has been treated with a water repellent to shield it from moisture from the outside and condensation on the inside. There are vertical baffles at the chest to prevent cold spots and distribute warmth evenly. For maximum insulation, the Trek TkI features a 3D side-wall baffle, which allows the down to loft to the very edge of the sleeping bag. The hood comes complete with a drawstring so that you can cinch it up and seal out the cold. If it gets too warm, you can adjust the hood so that it lies flat and heat doesn’t accumulate on the interior. The bag also features a 2-way YKK zip for easy entry and connecting it to another sleeping bag. Perfect for couples! Lastly, there’s a zip at the foot box to convert the sleeping bag into a blanket.An lightweight option for both big and small adventures!
Sea to Summit Trek TkI Down sleeping bag (Regular, blue) - Regardless of whether you’re staying in a hostel or sleeping in a tent, the Trek TkI down sleeping bag from Sea to Summit will keep you comfortable! The lightweight and packable sleeping bag boasts a tough outer shell and down insulation for optimal warmth. The down has been treated with a water repellent to shield it from moisture from the outside and condensation on the inside. There are vertical baffles at the chest to prevent cold spots and distribute warmth evenly. For maximum insulation, the Trek TkI features a 3D side-wall baffle, which allows the down to loft to the very edge of the sleeping bag. The hood comes complete with a drawstring so that you can cinch it up and seal out the cold. If it gets too warm, you can adjust the hood so that it lies flat and heat doesn’t accumulate on the interior. The bag also features a 2-way YKK zip for easy entry and connecting it to another sleeping bag. Perfect for couples! Lastly, there’s a zip at the foot box to convert the sleeping bag into a blanket.An lightweight option for both big and small adventures!
Sea to Summit Trek TkI Down sleeping bag (Regular, blue) - Regardless of whether you’re staying in a hostel or sleeping in a tent, the Trek TkI down sleeping bag from Sea to Summit will keep you comfortable! The lightweight and packable sleeping bag boasts a tough outer shell and down insulation for optimal warmth. The down has been treated with a water repellent to shield it from moisture from the outside and condensation on the inside. There are vertical baffles at the chest to prevent cold spots and distribute warmth evenly. For maximum insulation, the Trek TkI features a 3D side-wall baffle, which allows the down to loft to the very edge of the sleeping bag. The hood comes complete with a drawstring so that you can cinch it up and seal out the cold. If it gets too warm, you can adjust the hood so that it lies flat and heat doesn’t accumulate on the interior. The bag also features a 2-way YKK zip for easy entry and connecting it to another sleeping bag. Perfect for couples! Lastly, there’s a zip at the foot box to convert the sleeping bag into a blanket.An lightweight option for both big and small adventures!
Sea to Summit Trek TkI Down sleeping bag (Regular, blue) - Regardless of whether you’re staying in a hostel or sleeping in a tent, the Trek TkI down sleeping bag from Sea to Summit will keep you comfortable! The lightweight and packable sleeping bag boasts a tough outer shell and down insulation for optimal warmth. The down has been treated with a water repellent to shield it from moisture from the outside and condensation on the inside. There are vertical baffles at the chest to prevent cold spots and distribute warmth evenly. For maximum insulation, the Trek TkI features a 3D side-wall baffle, which allows the down to loft to the very edge of the sleeping bag. The hood comes complete with a drawstring so that you can cinch it up and seal out the cold. If it gets too warm, you can adjust the hood so that it lies flat and heat doesn’t accumulate on the interior. The bag also features a 2-way YKK zip for easy entry and connecting it to another sleeping bag. Perfect for couples! Lastly, there’s a zip at the foot box to convert the sleeping bag into a blanket.An lightweight option for both big and small adventures!
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The lowest price for Sea to Summit Trek Down Sleeping Bag TKI Regular right now is $179.00 at Snowys Outdoors, compared across 4 retailers.
The all-time low was $179.00 on 9 Oct 2025. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 8 June 2026.
