Gina Johnson
When it comes to sleeping bags, there are a variety of options available, each with its own unique features and specifications. One important factor to consider when choosing a sleeping bag is its size. While some sleeping bags are designed to be snug and form-fitting, such as the common mummy bag, others offer more room for the user to move around. Sleeping bags with more space, such as the Mountain Hardwear Lamina, may be preferred by those who feel restricted in tighter bags. However, it is important to note that a sleeping bag that is too spacious may not provide adequate warmth, as it will be more challenging for the body to heat up the extra space. Therefore, it is crucial to select a sleeping bag that offers a balance between comfort and warmth, especially when camping in cold weather conditions.
| Characteristics | Values |
|---|---|
| Temperature rating | -40°F to 20°F |
| Shape | Mummy cut, square taper, modified taper |
| Zipper | Large, sturdy teeth; stiff backing; left or right-handed |
| Fill | Down, synthetic or a combination of both |
| Fill power | 650-1000 |
| Size | Regular, long |
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What You'll Learn
Temperature ratings
It's important to remember that temperature ratings are estimates rather than precise measurements. Lab tests simulate sleeping bag usage with a test dummy dressed in base layers and a sleeping pad underneath the bag. However, these tests cannot account for individual variations, such as differences in body types, clothing, gear, and environmental conditions. Therefore, the actual comfort level of a sleeping bag in the outdoors may differ from its tested temperature rating.
Sleeping bags are typically categorised into summer, three-season, and winter bags based on temperature ranges. Summer bags are suitable for warmer climates, with temperature ratings of 30°F to 50°F. Three-season bags cover a broader range, usually from 20°F to 32°F, making them versatile for various conditions. Winter bags are designed for colder temperatures below 20°F, with some expedition bags rated as low as -40°F for extreme cold.
When choosing a cold-weather sleeping bag, it's essential to consider the expected conditions of your adventure. If you anticipate extremely cold temperatures, opt for a bag with a rating of at least -20°F, and for a larger margin of safety, consider a bag rated at -40°F. Additionally, pay attention to the insulation type, as goose down bags are popular for winter camping due to their excellent warmth and compressibility.
It's worth noting that temperature ratings may not always be accurate, and factors like changing weather conditions or individual differences can affect your comfort. Therefore, it's generally better to choose a bag that is "too warm" rather than one that might be "too cold." Additionally, you can enhance the warmth of your sleeping bag by using a sleeping bag liner, wearing appropriate clothing, and utilising a thicker sleeping pad.
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Bag size
The size of a cold-weather sleeping bag depends on several factors, including the user's body type, the anticipated weather conditions, and the specific features of the bag.
Firstly, it is important to consider the user's body type. Different people have different metabolisms, and some may feel colder or warmer than others in the same sleeping bag. It is crucial to choose a bag that provides enough insulation and warmth for your body type. People who tend to feel cold may opt for a bag with a higher temperature rating or additional insulation. On the other hand, those who usually sleep warm might prefer a bag with a lower temperature rating or one designed for better breathability.
Secondly, the anticipated weather conditions play a significant role in determining the size of a cold-weather sleeping bag. If you plan to camp in extremely cold environments, such as high-alpine terrain or polar regions, you will need a bag with a lower temperature rating, typically in the range of --20°F to -40°F. These bags tend to be larger and have more insulation to provide the necessary warmth. In milder winter conditions, a 0°F bag should be sufficient, while a 10°F to 15°F bag may be adequate for less frigid climates.
Additionally, the specific features of the sleeping bag contribute to its size. Bags with higher fill power, indicating the "loftiness" of the plumage, provide more insulation with less material. This results in a lighter and more compact bag. On the other hand, bags with lower fill power may require more insulation, making them bulkier. The shape of the bag also affects its size. The "mummy" shape is commonly used in cold-weather bags as it minimizes dead space, maximizing heat retention. However, some people may find this shape restrictive and uncomfortable, opting for a more tapered or rectangular design, which offers more room to move around but may require more insulation to maintain warmth.
Furthermore, the presence of additional features, such as a hood or snorkel, can increase the overall size of the bag. A hood helps retain heat and protect the face from cold winds, while a snorkel design extends from the mouth to keep frost from building up. These features add bulk to the bag but are crucial for warmth in extremely cold conditions.
Lastly, it is worth considering the user's preferred sleeping position. Some bags are designed specifically for side sleepers or those who tend to toss and turn, offering a wider cut that provides more room to move. These bags may be larger in size compared to those designed for back sleepers or narrower body types.
In summary, the size of a cold-weather sleeping bag depends on a combination of factors, including the user's body type, anticipated weather conditions, insulation type and amount, bag shape, additional features, and sleeping preferences. It is important to strike a balance between warmth and comfort to ensure a cozy and enjoyable outdoor experience.
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Zipper design
When choosing a cold-weather sleeping bag, the zipper design is an important consideration. A full-length zipper is essential in an emergency where you need to quickly tuck someone into the bag. The Feathered Friends Flicker 40 UL, for example, features a full-length 2-way side zipper that allows it to function as a hoodless mummy bag or an open quilt, extending its usable temperature range. The Flicker 40 quilt can be transformed into a mummy bag with its full-length zip and cinched footbed.
Some sleeping bags, like the Teton, feature a compression zipper in the footbox that can be unzipped to create more room. The Teton is rated to 15 °F and is ideal for car camping, although it is not designed for true cold-weather camping. The Zpacks Zip Around Sleeping Bag also has a full-length zipper that wraps around the footbox, allowing you to open the bag flat or vent your feet. It includes a zipper guard to prevent snagging and a draft tube to block cold air from entering through the zipper.
The REI Co-op Siesta Hooded 20 Sleeping Bag is another option with two zippers, one on each side, allowing it to be fully opened on one side and used as a large quilt. It also features a no-snag strip and draft tubes to prevent drafts. However, the Marmot Never Summer 0 sleeping bag has a dual-zipper design that is less practical in the backcountry, and the large hood does not retain heat as well as higher-performing bags.
For extreme weather conditions, the Western Mountaineering Puma Super MF sleeping bag is a good choice. It has a durable zipper with a protective flap that helps shed snow or water, ensuring that you stay dry and warm in cold temperatures. Stephenson's Warmlite Triple bag is another unique design that provides a comfortable and warm sleeping experience in extremely low temperatures.
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Fill power
When it comes to sleeping bags, fill power is an important consideration. It is a measure of the loftiness of the bag, or, in other words, how much the bag compresses and how high it lofts. The higher the fill power, the more loft your bag can hold, and the warmer your bag can be.
It is important to note that fill power alone does not determine the warmth of a sleeping bag. The warmth of a sleeping bag depends on various factors, such as the amount of down in the bag, the design of the bag, and the temperature ratings. For example, a spacious bag will be less warm than a narrow tapered mummy bag, even with the same fill power. Additionally, the cut and baffling of the bag can also impact its warmth. Therefore, it is essential to consider other factors in addition to fill power when choosing a sleeping bag for cold weather.
When comparing sleeping bags with different fill powers, it is helpful to consider the fill weight as well. The fill weight is the amount of down in the bag, usually measured in ounces or grams. By multiplying the fill power by the fill weight, you can estimate the relative warmth of the bag. For example, a 900 fill power bag with 2 ounces of fill weight will provide the same warmth as a 600 fill power bag with 3 ounces of fill weight. However, it is important to note that manufacturers may not always list the fill weight, so it can be challenging to make direct comparisons between bags solely based on fill power and fill weight.
In summary, while fill power is an important factor in the warmth of a sleeping bag, it should not be the only consideration. Temperature ratings, fill weight, design, and other factors also play a significant role in the overall warmth and performance of a sleeping bag.
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Hoods
When choosing a cold-weather sleeping bag, the key factor is its temperature rating. This is based on lab testing, which simulates how a sleeping bag should be used. However, it's important to remember that temperature ratings are estimates and may not always match your exact experience in the outdoors.
Now, onto the hoods. A snug-fitting hood on a sleeping bag can make a significant difference in warmth, especially in cold weather. It helps seal in the heat that your body is giving off and prevents it from escaping from your head and neck area. This feature is crucial if you plan to camp in freezing temperatures, as it can make your sleeping bag much warmer.
Some people may find hoods restrictive and less enjoyable, but they can always be folded in and used as a pillow if not needed. Additionally, a hood can serve multiple purposes beyond warmth. It can act as a pillow, make it easier to get into the sleeping bag, hold the bag up if you stick your feet out, and even keep your face clean if you move around during sleep.
When choosing a sleeping bag with a hood, consider the type of activities you'll be using it for. If you're primarily car camping, weight and bulk are less of a concern, and you can focus on finding the warmest and roomiest option within your budget. On the other hand, if you're backpacking or hiking, you'll want to prioritise lightweight and packable options that will keep you warm without adding too much weight to your gear.
In terms of temperature ratings, look for bags with lower temperature ratings than the lowest nighttime temperature you expect. For example, if you're anticipating temperatures around 20°F, consider a bag rated for temperatures below that, like the Mountain Hardwear Phantom 0 or the Never Summer 0. Remember that temperature ratings are based on an "average sleeper," so factors like your metabolism, clothing, and gear can also impact your experience.
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Frequently asked questions
First, you need to consider the coldest conditions you expect to encounter. Sleeping bags have temperature ratings that indicate the lowest temperature they can withstand. For example, a 0-degree bag will be comfortable in a wide range of winter conditions. If you're going to a frigid or polar region, consider a bag in the minus 20 to minus 40-degree range.
Getting the right size is crucial. Too much wiggle room inside the bag will make you colder, as there is more space for your body to heat up. The "'mummy cut' is the most thermally efficient option, but some people find it restrictive and uncomfortable.
Fill power measures the "loftiness" of the plumage used in a down bag. A higher fill power rating means you'll need less insulation to achieve the same warmth, resulting in a lighter bag. Bags with 800- to 1,000-fill down are suitable for serious cold-weather trips.
A draft tube is essential for cold weather as it adds insulation along the length of the zipper, a common entry point for cold drafts. A hood is also important, as it helps retain heat and protects your face from the wind. Some bags have snorkel hoods that keep frost from building up.
The Mountain Hardwear Phantom 0 and Never Summer 0 are popular options, with the former being one of the most compressible bags. The Teton is another highly-rated bag, rated to 15 °F. For car camping, the plush REI Co-op Siesta Hooded 20 Sleeping Bag is a good choice, and it comes in two sizes.
