How to Choose Sleeping Bags for Backpacking
Sea to Summit Trailhead ThII 30 Sleeping Bag
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A feature-packed yet value-oriented synthetic bag for weekend warriors and new campers, the Sea to Summit Trailhead ThII sleeping bag is no slouch when it comes to performance.
Shop similar productsKey Details
Fill
Synthetic fibers
Temperature Rating (F)
30 degrees (F)
- Tapered rectangular shape offers more space and comfort than a traditional mummy bag
- Synthetic insulation continues to keep you warm even if it gets damp
- Wave Loft construction helps retain warmth and loft
- Full-length #5 YKK® zipper allows bag to fully open and lie flat for use as a quilt
- Second zipper in footbox area allows ventilation for your feet
- Oversized, antisnag zipper draft tubes keep out the chill
- 30-denier nylon shell fabric is treated with a durable water repellent (DWR) finish that sheds moisture and helps block wind
- Lightweight 20-denier lining fabric is attached to the shell to prevent tangles
- Comes with a stuff sack
- NOTE: This bag is not designed to zip together with another bag
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 | 40 degrees (F) - EN |
| Temperature Rating (F) | 30 degrees (F) |
| Temperature Rating (C) | -1 degrees (C) |
| Shell | 30-denier nylon |
| Zipper Location | Left |
| Insulation Type | Synthetic |
| Fill | 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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Most Helpful Favorable Review
Happy Camper
Lorencamps11 months ago
I purchased this bag for backpacking. I haven't hiked with it yet, but I have gotten to try it overnight. It was warm enough, but I still added a liner because I run cold all the time. I'm a side and stomach sleeper and it has enough room for me to be on my stomach with my leg bent and all twisted up like a psycho. The best part was when it got cold enough, I pulled the drawstring and got it drawn up into a hoody. So, all the inside extra space didn't create air exchange and keep me cold. Its good, light, and comfortable. I'm very pleased.
Lorencamps
Big Sur, Ca
9 people found this review helpful
Most Helpful Critical Review
Not sustainable at 55F
crt994 years ago
I used it at 55F at night and I was lucky I had a spare down blanket. This bag was simply not warm enough. I'm Romanian born and a former skater, cold weather does not scare me. This bag just does not deliver as stated.
crt99
Los Angeles, CA
5 people found this review helpful
kgrill73
Colorado
Not 2.5 lbs
4 years ago
This sleeping bag weighs more than 2.5 lbs. I used it car-camping in Telluride in July (I'm from the south east US). It was cool enough outside to have a frosted car windshield when we woke up so roughly in the 30's-40's I'd assume. I was just a little chilly in my sweatpants, wool socks, and 2 sweatshirts in my tent with 2 other people. I also bought a 10 liter stuff sack for it- it just barely fits in the stuff sack (in a good way) but it definitely gets pretty small once its in there and strapped tight. Also I'm 5'7 and I was using the full length of the bag, and there's not much side to side wiggle room either- just enough to roll.
Age:25–34
Weight:125–150 lbs.
Height:5'7"
Yes , I recommend this product
Lorencamps
Big Sur, Ca
Happy Camper
11 months ago
I purchased this bag for backpacking. I haven't hiked with it yet, but I have gotten to try it overnight. It was warm enough, but I still added a liner because I run cold all the time. I'm a side and stomach sleeper and it has enough room for me to be on my stomach with my leg bent and all twisted up like a psycho. The best part was when it got cold enough, I pulled the drawstring and got it drawn up into a hoody. So, all the inside extra space didn't create air exchange and keep me cold. Its good, light, and comfortable. I'm very pleased.
Age:35–44
Yes , I recommend this product
michael3jo
California
Great warm bag that packs small
8 months ago
Recommend for sleeping where the average temperature is 35F. Slept in a long sleeve t-shirt and basic sweats and was fairly comfortable. Would add a liner or layer up in thicker pants and fleece sweater for a more comfortable sleeping experience below 35F. Packs pretty small and not the worst packing back into its sack. Good budget sleeping bag if you get on sale.
Age:25–34
Yes , I recommend this product
Adam
Who designs a sleeping bag that can't be put back into it's sack
4 years ago
Warm as rated, decent zippers. Roomy enough to be comfortable, but without carrying extra weight. HOWEVER, the bag simply cannot be put back into its sack UNDER ANY CIRCUMSTANCES, making the packed volume specification a total lie. Even machine packed by the factory this thing is really difficult to get out of the sack, and it's truly impossible to get back in. The headache this brings packing it back up every night is simply not worth it, so I returned it to the store and will buy a bag whose designers put a bit more thought into the user experience. Massive PITA to save what, 2g of extra sack weight for a sack that fits?
Originally posted on Sea to Summit
Tim
Arizona.
Warm, compact, light sleeping bag
8 months ago
Traded in my old bag for this one as it was rated for lower temps. Great back, very compact, lightweight and warm. Very pleased with this purchase, would recommend.
Age:45–54
Yes , I recommend this product
time travel
mid - atlantic
warm and light
9 months ago
Very happy with this purchase, not bulky like other synthetic bag, feels like a down bag, opens flat for use as a blanket, also very warm but have not tested it close to its threshold, looks like it will come in very handy for car camping come spring. Compresses very small to top it off. *****
Age:55–64
BillT
Very good for the price range but get the liner
1 year ago
I do a fair bit of motorcycle camping, so I wanted a sleeping bag that would pack up pretty small and light. But I'm also a slightly larger-than-average guy, so I wanted something that I could fit in comfortably. And since I'm not climbing K2 or anything, I didn't want to spend an arm and a leg on it. This bag fit the bill nicely. I'm not going to be camping when it's freezing out, so it's warm enough for the vast majority of what I do, although I have discovered that when it gets down to the lower end of the temp range this one is good for, I was chilly. So I bought the separate liner, which supposedly adds about 10 degrees of warmth, and I've slept comfortably (in my long johns and wool socks) down into the low 40s just fine.
Age:55–64
Weight:200–225 lbs.
Height:6'1"
Yes , I recommend this product
Tyler C
Southern Illinois
Good for price.
4 years ago
Took this camping over the weekend in early March. 27°F the first night, wore base layers and the only thing cold was my face. If I was slightly smaller in the shoulders and was a back sleeper this bag would have been perfect for me. As a side sleeper it was a bit of a hassle to turn on my side as the bag was a little tight fitting. But the warmth rating is spot on.
Age:25–34
Weight:200–225 lbs.
Height:6'0"
Yes , I recommend this product
R j
Florida
Long and Wide
1 year ago
I’m a big guy 6’2 and fat. The long wide size gives me enough space to be completely comfortable. The insulation seems adequate for a 30 degree bag but I haven’t tested it yet. The construction seems decent, the zipper is smooth. I’d rather the top seal with Velcro rather than a snap, but otherwise I am really happy with this bag.
Age:45–54
Weight:275–300 lbs.
Height:6'2"
Yes , I recommend this product
Matt
California
Pushed its weather capabilities
3 years ago
Works fantastic as I stretched it capabilities under 30F. Wrapped myself in a insulated blanket and snuggled in this bad boy in 22F weather at night in high altitude. I am personally not a big fan of mummy type sleeping bags as I prefer more room to move around as I am 6’6” (78” in) but it performed well and I have no complaints
Age:25–34
Weight:225–250 lbs.
Height:Taller than 6' 5"
Yes , I recommend this product
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