How to Choose Sleeping Bags for Backpacking
Sea to Summit Traveller Tr I Sleeping Bag
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Filled with 750-fill-power water-resistant duck down, the Sea to Summit Traveller Tr I Sleeping Bag is ideal for fast-and-light backpacking or year-round traveling to hostels and huts.
Shop similar productsKey Details
Fill
750-fill-power duck down
Temperature Rating (F)
50 degrees (F)
- High-loft 750-fill-power down offers superb warmth with minimal weight; Ultra-Dry Downâ„¢ water-repellent treatment protects down from moisture
- Ultra-Dry Down is a water-repellent polymer treatment applied to the down; Ultra-Dry Down retains 60% more loft and absorbs 30% less moisture than untreated down
- With a European Norm (EN) lower-limit rating of 50°F, the Sea to Summit Traveller Tr I will keep you comfortable on summertime backpacking adventures
- Traveller Tr I can be zipped together with another Traveller Tr I when you're not alone; Large size will comfortably accommodate 2 people when unzipped and used as a blanket
- Has a lightly tapered shape with collar and foot drawcords that can be cinched down to seal in heat and a create a mummy-shaped bag
- Lightweight ripstop nylon shell can be reversed so either the gray or teal color is on the outside
- Sea to Summit Traveller Tr I Sleeping Bag includes a lightweight Ultra-Sil compression stuff sack and a mesh storage bag
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 | Travel Backpacking |
|---|---|
| Tested Lower Limit | 50 degrees (F) - EN |
| Tested Comfort | 57 degrees (F) - EN |
| Temperature Rating (F) | 50 degrees (F) |
| Temperature Rating (C) | 10 degrees (C) |
| Ultralight | Yes |
| Shell | Ripstop nylon |
| Zipper Location | Left/Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 750-fill-power duck down |
| Lining | Nylon |
| Sleeping Bag Shape | Mummy |
| Shoulder Girth (in.) | Unavailable inches |
| Gender | Unisex |
Buying Advice
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Most Helpful Favorable Review
Great for a warm night or a warm hut!
Skier Scott11 years ago
I used this sleeping bag recently on a backcountry ski trip to a hut on the continental divide. It was perfect! Light and small in my pack. And plenty warm in the hut... I slept with the bottom-end draw string open!
Best things about it:
--The bag weighs only 14 ounces and comes with a compression sack. It packs down to an incredibly small size. I put it in a 5 Liter Sea to Summit eVac Dry Sack and had plenty of room for a sleeping bag liner.
--It has a full length zipper on one side (it’s a really small zipper, so you have to be a bit careful opening and closing it). It also has a drawstring at the foot end of the bag so you can open it up for ventilation.
--In summer I will use the bag opened up as a comforter.
Skier Scott
Boulder, CO, United States
26 people found this review helpful
Most Helpful Critical Review
Light but not warm
TerryD10 years ago
I really wanted to love this bag. I have a lot of other S2S gear, and it's all top quality, so I had high hopes. I bought it so cut ounces- it is super light, less than a lb, and if you use the included stuff sack it compresses to a little larger than a tall boy can size- hard to beat that. But what I do not like, is that because of the cut of the bag, you just cannot snuggle down into it if it's chilly at all. This is truly a hot weather bag. I would not take it out in less that 60-65 degree nights. It's also very narrow- and I am a very average sized person- 5'7,150. If I gain any weight this is going to feel claustrophobic. I'm on the fence as far as trading it in, because it does have qualities I like. It would work great as a quilt or a liner, but at that point I don't know if it's worthcarrying the extra weight. I also like that the down is sourced. So if you are fairly small/average sized and just want strictly a warm weather, lightweight bag, by all means, this is a good choice. If you're ever going to need more warmth (I took this to the White Mountains in July, bad idea). Keep looking - you may be better off with a Mtn Hardwear or Western Mountaineering bag.
TerryD
Virginia, United States
20 people found this review helpful
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RangerRobAZ
Phoenix, AZ, United States
Greatest bag ever
7 years ago
I love everything about this bag. It is so versatile. Opens up fully to a quilt, let’s you tie just the bottom and leave the rest open, or surrounds completely. And it compacts down to just nothing! It was unbelievable the first time I saw the stuff sack, I just kept stuffing and eventually it disappeared. Compresses down to the size of a grapefruit. I am a cold sleeper and I’ve had no problems using the bag in high 50s. Very warm for how thin it is. The 2 sizes for the storage sack are also really nice. Seriously get this bag unless you need something for colder temps.
Yes , I recommend this product
Skier Scott
Boulder, CO, United States
Great for a warm night or a warm hut!
11 years ago
I used this sleeping bag recently on a backcountry ski trip to a hut on the continental divide. It was perfect! Light and small in my pack. And plenty warm in the hut... I slept with the bottom-end draw string open! Best things about it: --The bag weighs only 14 ounces and comes with a compression sack. It packs down to an incredibly small size. I put it in a 5 Liter Sea to Summit eVac Dry Sack and had plenty of room for a sleeping bag liner. --It has a full length zipper on one side (it’s a really small zipper, so you have to be a bit careful opening and closing it). It also has a drawstring at the foot end of the bag so you can open it up for ventilation. --In summer I will use the bag opened up as a comforter.
Yes , I recommend this product
TommyPeq
The World
Every night
9 years ago
Awesome travel sleeping bag! It weighs nothing and take up almost no space! I actually take it on my carry on usually and pull it out during long layovers in overly air conditioned airports. I actually spelt in this bag every night for almost 6 months. Starting off in Australia, it was almost too hot for this bag some nights and living in a hostel it didn't get too cold, but I went camping quite a bit and one stretch of time I was pretty far inland and the temper dropped to around 40F at night and with a sleeping pad, base layers, and this bag pulled over my head and synched shut I wasn't cold at all. At this point I should add that I'm 6' tall and have the large bag. Also in Europe this came in handy while in hostels with poor heating. Never spent a night cold.
GlennBur
Warm Summer Bag
11 years ago
I received this bag as a gift just before a 4 night car camping trip to Hot Springs NC. The overnight temps were in the high 50's to low 60's and this bag was very warm. The only problem I had was kicking open the foot draw cord. It didn't matter because the bag and weather were warm.
Yes , I recommend this product
Ellie G
San Francisco, CA, United States
Can't beat it for the weight
10 years ago
Bearing in mind the temperature rating of this bag, this is amazing value. I'm a keen backpacker and bike camper, and I live in California where summer nights are often above 50. I got tired of schlepping around my 2lb, 25F bag. I've used this on most of my adventures last summer, and it worked a charm. I did buy Sea to summit's warmest liner, which packs a surprising punch. Also, I always have good base layers because it's what I wear in the evening - and I do sleep with them, so they add something. Given that I always want to use a liner (keepin' it clean!) and base layers, this bag adds just the amount of extra heat I need. I look forward to warmer camping nights where I'll use this as a quilt too. Last weekend I camped where it was supposed to be 45F overnight. I hesitated - I'd only used this bag above 50F - but it's so much smaller and lighter - and there was going to be so much climbing - that I took it. The night turned out to bottom at 30F, and while I wasn't warm - I woke up a few times from the cold - I still slept most of the night, which is saying a lot considering this is 20F below the rating for this bag. The only bad thing being that the drawcord on the footwell is super easy to open up by mistake - I've had to get good at flipping my feet over and closing it up with one hand! In other words, if you live somewhere with regular warm nights (45F and up), and you want to save on weight and/or space, this is an awesome piece of gear.
Yes , I recommend this product
TerryD
Virginia, United States
Light but not warm
10 years ago
I really wanted to love this bag. I have a lot of other S2S gear, and it's all top quality, so I had high hopes. I bought it so cut ounces- it is super light, less than a lb, and if you use the included stuff sack it compresses to a little larger than a tall boy can size- hard to beat that. But what I do not like, is that because of the cut of the bag, you just cannot snuggle down into it if it's chilly at all. This is truly a hot weather bag. I would not take it out in less that 60-65 degree nights. It's also very narrow- and I am a very average sized person- 5'7,150. If I gain any weight this is going to feel claustrophobic. I'm on the fence as far as trading it in, because it does have qualities I like. It would work great as a quilt or a liner, but at that point I don't know if it's worthcarrying the extra weight. I also like that the down is sourced. So if you are fairly small/average sized and just want strictly a warm weather, lightweight bag, by all means, this is a good choice. If you're ever going to need more warmth (I took this to the White Mountains in July, bad idea). Keep looking - you may be better off with a Mtn Hardwear or Western Mountaineering bag.
No, I do not recommend this product
natalie
So lightweight!
4 years ago
I cannot express how much I love this sleeping bag. I've had it for 4 years now and it's traveled literally hundreds of miles with me. It's still as awesome as when I first bought it. As a chronic overpacker, this helped me cut back on my weight SO MUCH - it's incredibly lightweight and packs down super small. Perfect for a backpack or in a suitcase. I've slept in/on it in 90+ degree heat, but I've also taken it down to 30 degree heat. Not exactly made for that, but if you bundle warm enough, it does a fair job keeping the heat in. I've taken a lot of care to make sure it stays nice. I keep it hanging in my closet, not in a stuff sack, and I have noticed a difference in longevity. This was a great purchase. Well worth it.
Yes , I recommend this product
Sister RA
Port Townsend, WA, United States
Epic!
8 years ago
I love this sleeping bag! It opens into a blanket and packs down really small. My feet get claustrophobic in sleeping bags but this one has an option to let your feet out. I'm taking it backpacking in Europe this summer. Highly recommended if you need a light sleeping bag for your carrying backpack.
Yes , I recommend this product
blu3bird
san francisco
perfect for travel
6 years ago
I just got back from 5 weeks of travel in Italy, Spain and the UK and this sleeping bag was perfect in many different environments. In Airbnbs and B&Bs it added extra warmth on cold nights as a blanket unzipped, it made overnight flights more comfortable, it made hostels more cozy, and can be used as a pillow when put in a medium size packing cube or in the compression sack. I only used it indoors in Europe in October so not sure if it's ideal for winter outside. Can't wait to try it for spring and summer camping.
Yes , I recommend this product
gianjoe
Melbourne, FL
Zipper broke after two years
5 years ago
This is a lightweight sleeping bag and has down material so it can do the job in places like Florida or maybe summertime up north. I have had this for two years, I use it typically as a comforter rather than getting into it because of the warm temps. Last night it got into the 40s and the zipper came off in the middle of the night. The bag ripped apart and I tried to fix it but couldn’t. I gave it to a friend who might be able to fix it, hoping so because it is a good sleeping bag. If I had to do it again I’d get the same thing but not in a mummy style.
No, I do not recommend this product
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