How to Choose Sleeping Bags for Backpacking
Sea to Summit Traverse TvIII 15 Sleeping Bag
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The warm and comfortable Sea to Summit Traverse TvIII 15 sleeping bag won't let you down, whether you're hiking through snow to sleep in an alpine hut or camping out after a summer storm.
Shop similar productsKey Details
Fill
Thermolite synthetic insulation
Temperature Rating (F)
15 degrees (F)
- Tapered rectangular shape offers more space and comfort than a traditional mummy bag
- Proprietary blend of THERMOLITE® insulation uses soft microfibers and fine-denier, hollow-core fibers for lightweight warmth, softness, with high loft and compressibility
- 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 | 15 degrees (F) - EN |
| Tested Comfort | 27 degrees (F) - EN |
| Temperature Rating (F) | 15 degrees (F) |
| Temperature Rating (C) | -10 degrees (C) |
| Shell | 30-denier nylon |
| Zipper Location | Left |
| Insulation Type | Synthetic |
| Fill | Thermolite synthetic insulation |
| 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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KindofOutdoors
Arkansas
Outstanding bag, just a little hard to roll up
1 year ago
Solid sleeping bag. Took it out for an overnight, resting some gear out, and it got down into the mid 20’s (F). I had wool socks, sweat pants, and a very light shirt on and I was cozy. My toes were a bit cold, but I probably should have taken my socks off. Be weary about any bad sleeping bag reviews saying “I had on all these clothes but I was still cold”. Most good sleeping bags are made to reflect your body heat, so if you have on too many clothes then the bag can’t do that. My only complaint is that it is difficult to roll up small enough to fit in the bag, but if you just shove it in without rolling then it’s easier haha. I would highly recommend this bag to anyone that’ll be in temps at least close to the 15* rating.
Age:18–24
Weight:175–200 lbs.
Height:5'10"
Yes , I recommend this product
Backcountry Jack
Pacific Northwest
Ok for a synthetic, not quite warm enough
1 year ago
It's alright. Comfortable, light for a synthetic, but I was cold with a low of 43 in a very sheltered tent with an insulated pad. And getting the thing in and out of the stuff sack is really a challenge. One of my gear pet peeves is when I need to use all kinds of energy just to get things put away. Not only is the sack really too small, it's coated on the inside with a sticky vinyl type material. Presumably that's to help with waterproofing but it really grabs onto the bag and makes both packing and unpacking prohibitively difficult. I haven't decided whether to keep this one yet (and just buy a new stuff sack) - there are SO few down alternatives and this is the lightest I've found, though still seems too big for backpacking.
Age:35–44
Weight:100–125 lbs.
Height:5'5"
No, I do not recommend this product
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
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
James W.
Good to Go
2 years ago
[This review was collected as part of a promotion.] I called out in 32 degree weather and slept like a baby.
Originally posted on Sea to Summit
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