Sleeping Bag Buying Guide: How to Choose the Right One for Camping
Western Mountaineering TerraLite 25 Sleeping Bag
$610.00 – to $630.00
Made for side-sleeping comfort, the Western Mountaineering TerraLite 25 sleeping bag is wider through the middle than at the shoulders for a roomy fit. Plus, both zippers open for use as a comforter.
Key Details
Fill
850+ fill-power goose down
Weight
6 FT Left Zip: 1 lb. 13 oz.
6 FT 6 IN Left Zip: 1 lb. 15 oz.
Compressed Volume
7.9 liters
Temperature Rating (F)
25 degrees (F)
- Designed with a wide girth through the middle of the bag—ideal for side sleepers
- Despite the comfortable shape and roomy interior, this bag weighs less than 2 pounds
- 12-denier ripstop nylon shell fabric is breathable and durable; 15-denier nylon taffeta lining material
- 2 zippers allow this bag to to open completely for greater temperature regulation; second zipper opens the bag up completely around the feet
- With both zippers open, this bag can serve as a fairly wide camper van comforter
- Zippers can also mate with Western Mountaineering mummy bags
- Full-length #5 YKK zipper provides a smooth, easy unzipping experience while saving weight
- Insulated draft tube blocks cold air and keeps the torso better insulated
- Insulated with 850+ fill-power ethically sourced premium goose down
- Continuous baffles allow you to shift down for more insulation in colder weather
- Comes with ultralight stuff sack and breathable mesh storage bag
- Part of the Western Mountaineering ExtremeLiteâ„¢ Series
Made in USA.
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 Western Mountaineering Camping 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 | Camping |
|---|---|
| Tested Lower Limit | 19 degrees (F) - ISO |
| Tested Comfort | 28 degrees (F) - ISO |
| Temperature Rating (F) | 25 degrees (F) |
| Temperature Rating (C) | -4 degrees (C) |
| Weight | 6 FT Left Zip: 1 lb. 13 oz. 6 FT 6 IN Left Zip: 1 lb. 15 oz. |
| Ultralight | Yes |
| Shell | Nylon ripstop |
| Zipper Location | Left |
| Insulation Type | Down |
| Fill | 850+ fill-power goose down |
| Fill Weight | 6 FT Left Zip: 1 lb. 2 oz. 6 FT 6 IN Left Zip: 1 lb. 3 oz. |
| Sleeping Capacity | 1-person |
| Lining | Nylon taffeta |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | 6 FT Left Zip: 72 inches 6 FT 6 IN Left Zip: 78 inches |
| Shoulder Girth (in.) | 65 inches |
| Hip Girth (in.) | 68 inches |
| Stuff Sack Size | 7 x 13 inches |
| Stuff Sack Volume | 7.9 liters |
| Compressed Volume | 7.9 liters |
| Gender | Unisex |
Buying Advice
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alexf49
Reno, NV
Side sleeper heaven!
1 year ago
This is one of those buy-once cry-once products because I never imagined I would ever spend this kind of money on a sleeping bag. I'm 6'4" and 265 lbs with very broad shoulders (size 50 suit jacket) so I ordered the long version and it fits perfectly for a side sleeper. Most mummy bags don't work for me because they make feel like my knees are tied together, with no way to turn on my side or on my stomach. This sleeping bag is so comfortable because I can move around in it and it still keeps me nice and warm. It's handmade in the USA, the zippers don't get stuck, it's really just next level and if your budget allows, this is a sleeping bag you can use for many, many years. The long TerraLite only weights only 31 ounces, which is a big deal for backpacking. At the end of the day, it's definitely an expensive sleeping bag but I think it's worth every penny if you need a top quality, ultralight backpacking sleeping bag.
Age:45–54
Weight:250–275 lbs.
Height:6'4"
Yes , I recommend this product
Sir CampAlot
Baton Rouge,Louisiana
A must have for side sleepers
1 year ago
Used the Terralite on AT 2015, I had 2oz more down added for extra warmth, being a side sleeper, it was perfect, comfortable and warm enough, some coldddd nights I wore layers…unfortunately after AT, I had to toss it, I could not get the hiker stink out of it even after washing it several times…I purchased another, but added 4oz extra down this time around…love this bag !
Age:65–74
Weight:150–175 lbs.
Height:5'6"
Yes , I recommend this product
EB907
Fairbanks, AK
Quiver Killer
5 months ago
I didn’t even buy this bag through REI but I love it so much I’m leaving a review here. This bag is a quiver killer - it is effectively a quilt that gives you the security of a real bag. It performs great for three season use, as it folds flat for hot nights and then zips up for cold nights. I’ve used this bag in the deserts of Mexico and the high Cascades with no issues. If you’re a side sleeper that runs warm and you want a nice bag, do not hesitate.
Age:18–24
Weight:200–225 lbs.
Height:5'11"
Yes , I recommend this product
Mike53959
Reedsburg WI
Great for side sleepers
6 months ago
Haven't had this bag long but tested outside at home in a bivy and it got several degrees below the bags rating and I stayed warm. It has plenty of room inside and is very comfortable for me as a side sleeper. Very well constructed with no down leakage. I am pleased with my purchase.
Age:55–64
Weight:175–200 lbs.
Height:5'9"
Yes , I recommend this product
PeterHiker
Seattle, WA
The Quality is Obvious
4 months ago
I just unboxed my TerraLite 25, and am impressed with the quality and utility. It was not cheap, even though I used my REI member sale 20% off coupon; but the value for money is obviously there. Everything about the bag is as advertised. At this time, however, I can't vouch for its warmth as I haven't used it outside yet. While camping and backpacking, at night I prioritize warmth and comfort. Getting in the bag at home, I immediately felt comfy -- a good sign! I moved around easily in it, to both sides and all the odd positions I find myself using at night. The loft seems ample. I am a super critical consumer; and after looking hard for something to quibble about, I could wish that the adjustment for the hood and collar drawstrings were on the same side as the zipper so that I didn't have to turn around to fully tuck myself in. That shows just how far I had to reach to find a "fault"! I have no doubt that it will keep me warm in my normal 3-season use, with a well insulated pad of course. Even before using it outdoors, I won't hesitate to rely on this bag as my only nighttime cover in temperatures down to about freezing. Will try to update after I use the bag in the field.
Age:75 or over
Weight:150–175 lbs.
Height:5'9"
Yes , I recommend this product
HikerDale
Fantastic, versatile bag
5 days ago
Fantastic, versatile bag that makes a great quilt in warmer times. Roomy even when zipped up.
Age:65–74
Weight:225–250 lbs.
Height:6'2"
Yes , I recommend this product
Steven93
Ely, Minnesota
Be smart and purchase
1 month ago
If you’re trying to decide between feathered friends and western mountaineering….get this one
Age:25–34
Weight:125–150 lbs.
Height:5'8"
Yes , I recommend this product