Miya Pearson
Sleeping bags are rated according to the International Organization for Standardization standard, using ISO 23537, also known as the ISO Test. The ISO test involves placing a heavily instrumented electronic mannequin, dressed in long underwear, inside the sleeping bag, and positioning it on top of a foam sleeping pad. The temperature of the air is then lowered, and the amount of electrical energy required to maintain the mannequin's initial temperature is measured. While this protocol ensures that all bag tests are done the same way, it cannot account for individual differences in body type, clothing, gear, and other factors. Therefore, it is important to consider your own needs and preferences when selecting a sleeping bag. If you plan to use the bag in temperatures around 10°C, you should look for a bag with an appropriate rating, such as the OutdoorZ Redwood, which has a rating of -10°F.
| Characteristics | Values |
|---|---|
| Temperature rating | 10-degree sleeping bags are rated for temperatures between -9°F to 10°F. |
| Use case | Suitable for winter camping or cold-weather climbing and mountaineering. |
| Weight | Warmer sleeping bags tend to be heavier. |
| Price | Warmer sleeping bags tend to be more expensive. |
| Bulkiness | Warmer sleeping bags tend to be bulkier. |
| Gender | Women's sleeping bags use the comfort rating, which is the temperature for colder sleepers. |
| Age | Older sleeping bags may lose their warmth over time due to a loss of loft and down. |
| Materials | Down, synthetic, cotton, flannel, nylon, or polyester. |
| Style | Mummy-style or quilt. |
| Brands | Feathered Friends, Western Mountaineering, The North Face, REI, Big Agnes, Mountain Hardwear. |
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Sleeping bag temperature ratings
Sleeping bags come with temperature ratings that indicate how warm they are. These ratings are determined through standardised laboratory tests, which produce a rating range for each bag. The EN (European Norm) rating system was the original standard, but today, the ISO (International Standards Organization) oversees bag testing, using a nearly identical method.
Lab testing simulates how a sleeping bag is used: a sleeping pad is placed under the bag, and a test dummy inside the bag is dressed in base layers. However, this protocol cannot account for variations like differences in body types, clothing, and gear. Therefore, the comfort level of a sleeping bag may differ from its tested temperature rating.
There are three main rating categories: international standards from EN or ISO, trustworthy homebrew ratings (usually from cottage companies), and ratings from untrustworthy companies who cheat the system. The EN/ISO standards include the following:
- Upper Limit: the temperature at which a standard male can sleep without excessive perspiration, with the hood and zippers open, and arms outside of the bag.
- Comfort: the temperature at which a standard female can expect to sleep comfortably in a relaxed position. This is the temperature rating used for women's bags.
- Lower Limit: the temperature at which a standard male can sleep for eight hours in a curled position without waking. This is the temperature rating used for men's bags.
The age of a sleeping bag can also impact its warmth. Over time, a bag may lose its loft and actual down filling, resulting in reduced warmth. Additionally, individual factors such as gender, body mass, circulation, and age can affect how warm someone feels in a sleeping bag.
When choosing a sleeping bag, it is important to consider the coldest conditions you anticipate and select a bag that will keep you warm at or below that temperature. For example, if you expect temperatures around 20 degrees, it is recommended to get a bag with a comfort rating of 15 or 20 degrees. It is generally advised to aim for a comfort temperature slightly lower than the lowest expected temperature.
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Bag weight and bulk
When it comes to bag weight and bulk, there are a few key considerations. Firstly, it's important to note that warmer sleeping bags tend to be heavier and bulkier than colder bags. This is due to the increased insulation and materials needed to provide warmth. Therefore, if you're looking for a bag specifically rated for 10-degree sleeping, you can expect it to be on the heavier and bulkier side compared to bags rated for higher temperatures.
That being said, the weight and bulk of a sleeping bag are crucial factors to consider, especially if you plan on carrying it in your backpack for extended periods. An extra pound or two can make a significant difference on long backcountry trips, and a larger packed size can increase the overall size of your backpack, affecting your comfort and balance. So, while you want a bag that will keep you warm, you also want to minimise weight and bulk as much as possible.
Ultralight sleeping bags are ideal for those who want to keep their packs as light as possible, usually aiming for under 10 pounds. These bags often use thinner materials and may even forego zippers, cords, and buckles to reduce weight. Mummy bags, known for their tapered shape, are popular among ultralight enthusiasts as they offer a great warmth-to-weight ratio. However, some people may find the tapered design restrictive and uncomfortable.
If you're looking for a balance between warmth and weight, bags with lightweight down insulation are a good option. These bags provide excellent warmth relative to their weight, making them perfect for human-powered adventures where you need to carry your gear. However, these bags tend to be more expensive due to the specialised materials and construction required.
Finally, it's worth mentioning that the packed size of a sleeping bag can often be reduced by using compression sacks or roll-top dry bags. These allow you to squish the contents and roll the top to compress the bag to a smaller size. Additionally, storing your sleeping bag uncompressed when not in use will help maintain its loft and insulation over time, reducing the need for excessive bulk.
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Bag cost
The cost of a sleeping bag depends on a variety of factors, including the temperature rating, brand, materials used, and features. Generally, warmer sleeping bags tend to be more expensive, in addition to being heavier and bulkier.
When it comes to temperature ratings, a 10-degree sleeping bag would fall within the range of a 3-season sleeping bag, which typically has a temperature rating of 20 degrees or higher. Bags with lower temperature ratings, such as 0 to 10 degrees, are considered winter sleeping bags and often come with a higher price tag due to the increased warmth and insulation they provide.
Some popular brands in the market for sleeping bags include Feathered Friends, Western Mountaineering, The North Face, REI, Big Agnes, Mountain Hardwear, and Enlightened Equipment. The price of a sleeping bag can vary depending on the brand, with some higher-end options offering superior performance and durability at a premium cost.
The materials used in the construction of the sleeping bag also play a role in determining its cost. Bags with natural insulation, such as goose down, tend to be more expensive but offer better warmth-to-weight ratios. Synthetic insulation, on the other hand, is often more affordable but may not provide the same level of warmth and compressibility.
Additionally, features like full-length zippers, hoods, draft collars, and water resistance can drive up the cost of a sleeping bag. For example, the Feathered Friends Flicker 40 UL, which can be used as a hoodless mummy bag or an open quilt, is priced higher due to its versatility and innovative design.
While the specific cost of a 10-degree sleeping bag can vary depending on the factors mentioned above, it is safe to assume that a bag with this temperature rating will likely fall within the mid-to-high-end price range, especially if it is from a reputable brand and incorporates high-quality materials and features.
It is always a good idea to research and compare different options, considering your budget and specific needs, to find the best sleeping bag that suits your requirements without breaking the bank.
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Bag brand
Sleeping bags are now rated according to the International Organization for Standardization standard, using ISO 23537 (also known as "the ISO Test"). This test involves placing a heavily instrumented electronic mannequin, dressed in long underwear, inside the sleeping bag, and positioning both on top of a foam sleeping pad. The temperature of the air is then lowered, and the amount of electrical energy needed to maintain the mannequin's initial temperature is measured.
Today, most brands send their sleeping bags to independent labs that assign bag temperature ratings. The EN (European Norm) was the original standard adopted by the sleeping bag industry. Now, the ISO (International Standards Organization) oversees bag testing, but the method is almost identical to the EN bag test.
When choosing a bag, it is recommended to check the lowest expected temperature at night and then subtract 10 degrees to be safe. For example, the REI Co-op Magma 15 has a 28°F ISO Comfort rating (16 °F Lower Limit), which would be suitable for temperatures that dip down to around freezing.
- Coleman - Amazon offers a range of 10-degree sleeping bags from various brands, including Coleman.
- Kelty - Also available on Amazon, Kelty sleeping bags are another option for 10-degree temperature ratings.
- OneTigris - OneTigris is another brand that offers 10-degree sleeping bags, available for purchase on Amazon.
- Mountain Hardwear - Mountain Hardwear is a brand that has been tested by outdoor gear enthusiasts, with their bags being taken on family camping trips, backpacking adventures, and winter expeditions.
- Feathered Friends - Feathered Friends is a brand that offers the Swallow YF 20 Sleeping Bag, which is light and lofty, using 900-plus-fill RDS-certified goose down. Their Snowbunting bag is also rated to zero degrees, making it suitable for extremely cold temperatures.
- Western Mountaineering - Western Mountaineering's down maintains its loft better than many other companies, offering a value advantage over time. Their Kodiak MF bag is a good option for those frequently camping in cold temperatures.
- The North Face - The North Face is another brand that has been tested by outdoor enthusiasts, and their bags have been taken on a variety of trips and expeditions.
- REI - In addition to the REI Co-op Magma 15 mentioned earlier, REI also offers the Siesta bag, which provides more room for moving around compared to mummy-style bags.
- Big Agnes - Big Agnes is a brand that has been tested by outdoor gear reviewers, and their bags have been taken on various adventures.
When choosing a sleeping bag, it is important to consider factors such as temperature rating, weight, bulkiness, cost, and personal preferences for features like zippers or draft collars. Additionally, it is worth noting that temperature ratings are estimates, and individual factors such as clothing, gear, body type, weather conditions, and food intake can also impact the comfort level of the sleeping bag.
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Bag style
When it comes to bag style, there are a few options to consider for a 10-degree sleeping bag. The first is the bag's shape. Mummy-style sleeping bags are tapered to the feet, allowing for a more snug fit and are ideal for cold conditions. They are available in different sizes, such as regular and long, to cater to different user heights. Mummy bags can be quite restrictive in terms of movement, so if you prefer more room, a car-camping bag might be a better option.
Another style to consider is the ultralight sleeping bag. These bags are designed to keep the weight to a minimum, making them ideal for multi-day trips and hikes. They often have a narrower cut and thinner materials, and some may even forgo features like zippers, cords, and buckles. Ultralight bags come in mummy and quilt styles, with quilts gaining popularity in recent years.
If you're looking for a bag that provides a balance between warmth and weight, a three-season backpacking bag with a 20-degree rating could be a good choice. These bags offer versatility and can be used in a wider range of temperatures.
Additionally, it's worth noting that sleeping bags for women tend to use a comfort rating, which indicates the temperature at which a colder sleeper would be comfortable. Women's bags typically have more insulation to achieve the same comfort rating as men's bags, resulting in slightly heavier weights.
Lastly, consider the materials used in the bag's construction. Bags with RDS-certified, 900-plus-fill-power down offer exceptional warmth and are highly sought after. Bags with water-resistant shells and coatings, such as the DWR (durable water repellent) coating, are ideal for rainy conditions.
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Frequently asked questions
The best 10-degree sleeping bag for you will depend on your budget, the type of trip you are going on, and your personal preferences. Mummy-style sleeping bags are great for saving space and weight, but they can be restrictive. The Feathered Friends Swallow YF 20 Sleeping Bag is a high-quality, lightweight option, while the Montbell Down Hugger is a good choice if you're on a budget.
Temperature ratings on sleeping bags are assigned through standardized testing, such as the ISO 23537 test. However, these ratings are only estimates, and individual factors such as body type, clothing, and weather conditions will also affect how warm you feel. It's a good idea to choose a bag that is rated at least 10 degrees colder than the lowest expected temperature.
When choosing a 10-degree sleeping bag, look for features that will help retain heat, such as draft tubes, offset stitching patterns, and insulated footboxes. The type of insulation and shell material will also affect the warmth and weight of the bag. Bags with down insulation tend to be warmer and more lightweight, but they can be more expensive.
If you're looking for a warmer option, you could consider a 0-degree sleeping bag like the Feathered Friends Snowbunting or the Nemo Sonic 0. For milder temperatures, a 20-degree or 30-degree bag might be more suitable, and these will also be lighter and cheaper.
