Winter Bivvying in the Alps: What Is a Good Temperature Rating for a Sleeping Bag

If you sleep only in a bivy bag direct on snow you need to have a sleeping bag with a good isolated pad for the temperature in the forecast at least.If you sleep in a well build igloo the temperature is much warmer than the outside.For a snow cave you can plan with this given temperatureFrom my personal experience I used a comfort -2 Celsius degree sleeping bag in a igloo/snow cave with a isolated sleeping pad and i was comfortable warm during the night. The temperature outside was down to -20 C. And if you are still cold you could also wear long underwear or your down jacket/pants/socks like on some expeditions and wear also a hat/buff on your head. Then you can go with a cheaper and lighter sleeping bag. :).

1. How To: Pick a Sleeping Bag

Has it happened to you? I was camping at 11,500 ft at Guitar Lake along the John Muir Trail on the last day of a 2013 backpacking trip with my 3 sons. The low overnight temperature was 32 degrees, and while I should have been comfortable in my 30 degree rated sleeping bag, even with all my clothes on, I was barely warm. While it may be impossible to always sleep warm, careful section of a sleeping bag can make a warm night more likely. When selecting a sleeping bag, seven interrelated factors need to be considered. They are (mnemonically): 4Ws, 2Cs, and 1D. Sleeping bags are rated. One rating is provided by the manufacturer and another is based on a standardized test - the EN (European Norm) rating. As my Guitar Lake experience suggests, the manufacturer's rating may not be an accurate measure of real-world warmth, and differs between manufacturers - one company's 30 degree bag may be warmer than another company's 30 degree bag. The EN rating was developed to allow more accurate comparison between bags from different companies. Not all bags are EN rated. For those that are, two numbers are provided: the Comfort rating, and the Lower-limit rating. The Comfort rating is the lowest temperature at which the bag will keep the average woman or cold sleeper comfortable. The Lower-limit rating is the lowest temperature at which the bag will keep the average man or warm sleeper comfortable (women tend to sleep "colder" than men). For example, REI sells the Igneo 17 sleeping bag. As the name suggests, REI rates the bag to 17 degrees. The EN Comfort rating is 28 degrees, and the Lower-limit rating is 17 degrees. Unless you are a warm sleeper, I would rely on the EN Comfort rating. Since you have to carry it, lighter is better. Generally, down is lighter than synthetic insulation for comparable warmth. Also, a shorter size will be lighter, so get the shortest size that fits you. An additional benefit of a shorter bag is it will be warmer, because there is less space for your body to heat. The shape of the bag affects weight. Mummy shapes are generally lighter than rectangular shapes, for a given warmth. Some bags are specifically designed for women. This may simply mean the bag is shorter or contoured differently than the man's version, but it might also mean extra insulation in the upper body or foot area, as women tend to get colder in those areas. Especially in our rainy and snowy climate in the PNW, weather resistance is important. Weather resistance is affected by the sleeping bag insulation and its shell. Wet insulation provides less warmth. This is more pronounced for down than synthetics, though water-resistant downs reduce the difference. A weather resistant shell helps keep your insulation drier and, therefore warmer. However, a shell that is too impermeable to moisture might retain the moisture your body gives off during the night, wetting your insulation from the inside. Keeping your bag dry in your pack is also important, so I carry my sleeping bag in a dry bag. A more compressible bag takes up less space in your pack, and may allow you to carry a smaller and lighter, pack. Down is usually more compressible than synthetic insulation bags. Down also has varying compressibility, measured by its Fill Power (FP), which is the cubic inches of volume filled by 1 ounce of down. Thus, 800 FP down is more compressible than 700 FP down. A side benefit of greater compressibility is a bag using higher FP down will be lighter, all other things being equal. While a compression stuff sack can be used to reduce stuffed volume, it adds weight and cost over a non-compression stuff sack. All other things being equal, less expensive is better. In reality, reducing cost involves tradeoffs. For example, while synthetic-insulated bags are generally less expensive than down bags, they are likely heavier, less compressible, and less durable. Sleeping bags are expensive, so you want them to last. Down generally lasts longer than synthetics, which tend to lose loft (and therefore warmth) with age and repeated stuffing. A sleeping bag alone will not keep you warm. Your bag's insulation underneath you will compress and provide much less warmth, so you need something additional underneath you to provide insulation from the cold ground (or snow) - a sleeping pad. The insulating value of a sleeping pad is measured by its R value - higher is better. For camping on ground, I would get a pad with an R value of 2 or greater, though in warm temperatures a lower R value should work. For camping on snow, I would get an R value of 5 or more. One option for snow camping is to stack 2 sleeping pads. R values add, so stacking an R value 2 pad over an R value 3 pad is the same as a single R value 5 pad. EN ratings do not apply to cold weather bags, so you must base your decision on the manufacturer's rating (and reputation). For winter camping, you might want to size up your bag, to leave room in the bottom of your bag for boots and other items you want to keep from freezing. Also, for winter camping, a weather resistant shell is more important, because in cold temperatures frost tends to form on the inside of your tent, and then fall onto your sleeping bag - especially when wind is shaking your tent. Weather resistance is particularly important for snow caves; here, you might even want to use a Bivy bag to protect your sleeping bag from snow. Future articles will address some related issues, including: sleeping quilts and additional steps you can take to stay warm while camping!

2. sleeping bag for summer backpacking?

A sleeping bag liner would work great for your needs

3. Synthetic vs Down? Sleeping Bag?

go for synthetic. fibres like qualofill, they are much lighter, dry faster, antibacterial blah blah blah.. what you look for is what you need, if you are planning massive expeditions then you will want something lightweight, otherwise your best guide is the "season" rating of a bag, a 2-3 season is really only good in warm climes and dry conditions, whereas a 5 season will see you through sub zero alpine work. one that is long enough for your person, has a hood with drawcord, packed size, packed weight, are considerations if you are sleeping out then you will want one that either has a damp proof underside or even mat inserts. ask the guys in store what they use, if they dont use sleeping bags then go to another store. being warm is essential to being alive so get the one at the top of your budget,

sleeping bag related articles
Condense Your Sleeping Bag to Take on a Plane?
Where Can Buy a Sleeping Bag for Newborn?
Camping: What Sleeping Bag Should I Buy?
My Step-sister Is Sleeping in a Sleeping Bag on Top of the Hotel Bed and Brought Her Own Pillow?
Ideas for a Sleeping Bag Cover?
you might like
Products OEM YOGA Products Women's Active wear
Yg-002 Sleeping Bag Concises YuGa Sports Brand
Concises YuGa Sports Brand Carton Sleeping Bag Carton Factory
Sleeping Bag China Concises YuGa Sports
Yg-002 Sleeping Bag Yg-002 Concises YuGa Sports Brand-1
Hot Solid Color Sleeping Bag Solid Color Concises YuGa Sports Brand

Copyright © 2020 Concises YuGa Sports | Sitemap