How to Choose Sleeping Bags for Backpacking
Sea to Summit Traverse TvII 25 Sleeping Bag
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Hike through snow to sleep in an alpine hut or camp out after a summer storm with confidence. The Sea to Summit Traverse TvII 25 sleeping bag won't let you down.
Shop similar productsKey Details
Fill
THERMOLITE synthetic fibers
Temperature Rating (F)
25 degrees (F)
- Tapered rectangular shape offers more space and comfort than a traditional mummy bag
- WaveLoft™ construction and high-quality THERMOLITE® insulation are lofty and durable for lasting warmth
- Anatomically shaped footbox offers extra space
- Oversize antisnag zip draft tubes and neck draft tube
- Free-Flow half-zip right side, full-length zip left side and separate foot zips offer freedom of movement and increased ventilation
- 30-denier nylon shell treated with durable water repellent (DWR) and 20-denier nylon lining are lightweight and compressible fabrics
- Lining fabrics attached to shell prevents tangles
- Includes strong 70-denier compression sack
- 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 | 25 degrees (F) - EN |
| Tested Comfort | 35 degrees (F) - EN |
| Temperature Rating (F) | 25 degrees (F) |
| Temperature Rating (C) | -4 degrees (C) |
| Shell | 30-denier nylon |
| Zipper Location | Left |
| Insulation Type | Synthetic |
| Fill | THERMOLITE synthetic fibers |
| Sleeping Capacity | 1-person |
| Lining | 20-denier nylon |
| Sleeping Bag Shape | Semirectangular |
| Stuff Sack Size | Unavailable |
| Stuff Sack Volume | Unavailable |
| Compressed Volume | Unavailable |
| Gender | Unisex |
Buying Advice
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user17
Portland, ME
Comfortable but not warm
4 years ago
I like the feel & design of this sleeping bag. There's a full-length zipper on one side to get in/out and a half-length zipper on the other side for ventilation or movement. The hood is great for holding a semi-circle pillow in place. The bag packs up into the stuff sack easily and is small and lightweight. However, Idk how this is rated to 35 degrees for women ("comfort"), 25 degrees for men ("lower limit"), and -6 for survival ("extreme). As a woman I find this bag comfortable to about 50 degrees, with sweatpants and a sweatshirt on. I've used it for 38-40 degrees, but only with a fleece blanket inside, while wearing multiple layers on top & bottom.
Age:25–34
Weight:125–150 lbs.
Height:5'8"
Ian A.
Solid synthetic bag
4 years ago
I’ve only had it out on a 45* night so far but within 10 minutes of getting into it, and several times throughout the night, I had to vent it because it got to be too warm. That’s not the bag’s fault; all the bags I’ve had until now are 10-15 years old so I’m used to having to squeeze every bit of insulation out of them that is possible. What I should have done is open up the zipper and perhaps every use it as a blanket instead in warmer weather like I had. The construction of the bag was very well thought-out; especially the zipper design that pairs with the women’s bags and the small loops for attaching cord (I used elastic shock cord) to keep a sleeping mat from sliding out from underneath you are a nice touch.
Originally posted on Sea to Summit
Andrew
New England
Best sleeping bag so far.
4 years ago
So comfortable, shocked at how warm it actually is. Fits just right.
Age:18–24
Weight:150–175 lbs.
Height:5'7"
Yes , I recommend this product
JimK
Bellingham, WA
Not remotely as warm as advertised
3 years ago
This bag claims to be rated to 25 degrees comfort for men. It's not even close. I woke up repeatedly, freezing cold, wearing long underwear top. At 4 in the morning I was shivering in the bag. I checked my phone for the temperature at the nearest weather station: 42 degrees. I put on pants and a light jacket, crawled back in, and was STILL cold in the morning.
Height:5'7"
Age:55–64
Weight:200–225 lbs.
No, I do not recommend this product
Angela S.
Love this sleeping bag
10 months ago
[This review was collected as part of a promotion.] I bought the tall and wide version because I like my space. It worked well in summer and also on our latest camping trip with temps dropping to -3 celsius over night. I don't go much colder. For the lower temps i use a reactor xtreme liner and will get myself a pair of down booties. My feet are cold at the best of times and the down jacket around my toes kept slipping away.
Originally posted on Sea to Summit
Tami C.
Great sleeping bag
3 years ago
My husband and I purchased these sleeping bags. My husband got the longer one because he is 6'3". They were very comfortable and we like the extra room for the feet. The material does stick to your skin a bit so I am going to order some liners. They packed up easy in their bags and fit perfectly into our packs. We have not used them yet for colder weather yet.
Originally posted on Sea to Summit
TSZ C.
Pretty, Very Comfortable Surface and warm
1 year ago
I have been using this sleeping bag for a camping trip in Switzerland for half month in September. There is occasional rain but the bag can still keep warm. The lowest temperature at night I tried was 2 degree celcius. The bag and I performed well because I also wore enough clothes and sock when sleeping outdoor. Overall, I am very satisfied.
Originally posted on Sea to Summit
Juan E.
First of all this picture
4 years ago
First of all this picture is not true the sleeping bag is not smaller than the water bottle. And it’s heavier than it looks. If your looking for light weight compact, this is not for you.
Originally posted on Sea to Summit
Chris Z.
Bag worth owing
2 years ago
[This review was collected as part of a promotion.] Only used the bag once so far in 45° weather but slept comfortably with zipper open for venting. The long fit my 6’2” frame with room to move around.
Originally posted on Sea to Summit
Rachel L.
Best synthetic sleeping bag
1 year ago
[This review was collected as part of a promotion.] The features on this bag make it the best synthetic sleeping bag I’ve ever tried. It’s also warmer than I expected. I’m a very cold sleeper.
Originally posted on Sea to Summit
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