How to Choose Sleeping Bags for Backpacking
Sea to Summit Trek TkI 30 Sleeping Bag
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For adventurers looking for maximum versatility at a moderate price, the Sea to Summit Trek TkI 30 sleeping bag offers traditional comfort and value, with an anything but traditional design approach.
Shop similar productsKey Details
Fill
650+ UltraDry down
Temperature Rating (F)
30 degrees (F)
- Tapered rectangular shape offers comfort and versatility
- 650-fill-power Loft UltraDry Down™ certified to the Responsible Down Standard (RDS) offers insulation and compressibility
- Vertical chest baffles prevent down migration and cold spots
- 3D side-wall baffle maximizes loft right to the edge
- 3D hood draws in tight when needed
- 2-way #5 YKK side and foot zips provide ventilation
- Oversize zip draft tube features antisnag material; neck collar draft tube seals out cold drafts
- Large internal security pocket
- Soft-touch 20-denier lining fabric is lightweight and highly breathable; 30-denier nylon shell is durable
- Includes Ultra-Sil™ compression bag for compact storage
- This bag is designed to zip with another (second sleeping bag sold separately)
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Sea to Summit Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 30 degrees (F) - EN |
| Tested Comfort | 41 degrees (F) - EN |
| Temperature Rating (F) | 30 degrees (F) |
| Temperature Rating (C) | -1 degrees (C) |
| Shell | 30-denier nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 650+ UltraDry down |
| Lining | 20-denier nylon |
| Sleeping Bag Shape | Semirectangular |
| Stuff Sack Size | Unavailable |
| Stuff Sack Volume | Unavailable |
| Compressed Volume | Unavailable |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |
Buying Advice
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Susan B.
Solid bag comfy
4 years ago
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!
Originally posted on Sea to Summit
Where L.
Thoughtful construction for warmth and comfort
7 years ago
I bought this bag and immediately spent 17 nights in it. The lows were in the twenties most nights. The Trek 1 provided warmth and comfort. The cut of the bag is comfortable and great for someone that may like to alternate sleeping positions during the night. The baffles around the zipper and foot box held all drafts out. (sleeping under tarp). The cinches down tight. The bag packs down tight and dries out quick when wet. I train wilderness instructors and everyone that saw it and inspected it was impressed by the level of construction and details put into the bag.
Originally posted on Sea to Summit
Happy C.
Where to start?! Warm, ability to open foot area to reduce heat on hotter nights and ability to use as a blanket
7 years ago
Where to start?! This sleeping bag has so many great features. I have been looking for a sleeping bag that has a low degree temperature rating and could be coupled with another to make a double wide sleeping bag for two. I found all I wanted in the Trek plus a lot more. The low temperature rating has kept me warm and cozy during cold fall nights and mornings. It also has kept me the perfect temperature during summer nights by unzipping it all the way and using it as a blanket. The outside and dry down feathers have stood up to condensation and when a leak magically appeared in the top of my tent. My partner and I have also enjoyed the ability of zipping two Trek sleeping bags together to for one large sleeping bag we can sleep snugly together in. Great bag!
Originally posted on Sea to Summit
Michael S.
Not quite sure this is
5 years ago
Not quite sure this is the right bag for me. Quality seems really good zippers and all. But when trying to sleep in it for a week of cool summer nights in our camper (50-60 degrees) in my boxers, and tee shirt, it was not comfortable to me. I was warm enough, but it felt like saran wrap type sticky-ness on my legs as the bag wanted to cling to me. I was clean and not sweating but it felt too weird to me. After one night I just opened it up used it as a top blanket comforter, and put a blanket under me. I do not sleep in pajamas so I guess I will have to buy a thin liner for it? hmmm. I bought it for backpacking due to the weight/quality and fall weather temps, so looks like I need to make an adjustment to my use. none of my synthetic bags I have feel like this too me when I sleep in them.
Originally posted on Sea to Summit
Ken
Lightweight and Cozy
6 years ago
Light as a feather and warm enough to keep me comfortable throughout the night, I was surprised just how well the sleeping bag performed in the Adirondack Mountains. I used S2S's sleeping mat to go along with it, and I have NO complaints! It actually was warm enough to make me open the bag a little bit for a little cooling! It was easy to pack with the accompanying compression dry sack and made my camping experience pleasurable.
Originally posted on Sea to Summit
Teal G.
Sweet bag holds up to SE Alaska Summer
4 years ago
Took this bag out on a sea kayaking trip in Juneau. It poured and everything was damp. Not only was I dry and toasty, but the foot zipper was clutch when the tent got too warm. This bag is made well, fabric is nice and comfortable. Dried quickly when exposed to swamped kayak conditions. Would buy again and recommend for anyone looking for a solid versatile bag. Also shipping was fast and customer service off the hook!
Originally posted on Sea to Summit
Brice C.
Awesome Sleeping Bag!!
4 years ago
I have the 18F, regular and wide version of this sleeping bag! I love them! Small, light weight and compact, but when laid out for sleeping it is very lofty and provides a lot of warmth. It is hard to imagine that it can compress down into the small compression sack I carry it in! I use it for backpacking and for Boundary Waters trips and I have never been cold.
Originally posted on Sea to Summit
Brendan J.
Best Bag for the Money Hands Down
6 years ago
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 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.
Originally posted on Sea to Summit
Chris P.
The only 3-season bag you'll ever need
4 years ago
Since I purchased this down sleeping bag, I've slept out in cold spring conditions (nights down to 25 degrees). It has kept me toasty warm, never too hot, just comfortable. The material is very high quality; I just know this sleeping bag is going to last for decades. Can't wait to take it backpacking!
Originally posted on Sea to Summit
Jonny
Very Dissapointed
3 years ago
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 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.
Originally posted on Sea to Summit
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