
Sleeping bags are designed to provide warmth and comfort for people sleeping outdoors, or in otherwise uncomfortable conditions. They come in a variety of shapes and sizes, with different bags being made of different materials and possessing different features depending on their intended application. Sleeping bags can be a good option for those camping or backpacking, as they are easy to transport and store. However, some people find them uncomfortable, particularly if they are side sleepers or if they don't have a mattress or sleeping pad to provide a softer surface.
| Characteristics | Values |
|---|---|
| Comfort | Depends on the sleeping bag's quality, with higher-end options providing more comfort |
| Temperature Ratings | Lab-tested ratings are useful for comparing bags, but real-world comfort may differ due to variables |
| Shape | Square, mummy, and 'spoon' shapes are available, with mummy bags being lighter and more compact |
| Insulation | Down filling is more expensive, lighter, and extremely insulating, while synthetic filling is less expensive, easier to clean, and retains insulating power when wet |
| Weight | Heavier bags are often more comfortable, but weight is a critical factor when backpacking |
| Price | Sleeping bags range from cheap to expensive, with higher prices often indicating better comfort |
| Use Case | Sleeping bags are designed for different applications, with car campers prioritising comfort and cost savings |
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What You'll Learn

Sleeping bag or mattress?
Sleeping bags are a convenient option for those who enjoy outdoor activities such as camping, hiking, or backpacking. They are portable, lightweight, and easy to pack, making them ideal for travellers who need to carry their gear over long distances. However, when it comes to comfort, sleeping bags may not be the best option, especially when compared to a traditional mattress.
Sleeping bags come in various shapes, sizes, materials, and features, catering to different applications and preferences. The most common types are square bags and mummy bags. Square bags are usually bulkier and heavier, targeting car campers who do not need to worry about weight and portability. On the other hand, mummy bags are designed to be more lightweight and compact, making them a popular choice for backpackers and hikers. Mummy bags also have less 'dead space', requiring less energy to heat up, which can be advantageous in cold conditions. Additionally, some bags have a 'spoon' shape, attempting to bridge the gap between the square and mummy designs.
When considering comfort, it is essential to distinguish between temperature comfort and physical comfort. Sleeping bags are primarily designed to provide warmth, with temperature ratings indicating the lowest survivable temperature rather than a comfortable temperature. To achieve a comfortable temperature, it is recommended to add 20 °F to the bag's rating. However, it is worth noting that these ratings are estimates and may not account for individual variations in clothing, body type, weather conditions, and other factors. Therefore, a sleeping bag with a suitable temperature rating may still not provide the expected level of warmth for everyone.
Physical comfort in a sleeping bag depends on various factors, including the shape, size, filling, and personal preferences. Side sleepers, for example, may find mummy bags restrictive and uncomfortable. In contrast, other bags, such as the Sidewinder, are specifically designed for side sleepers, allowing for easy movement and position changes during sleep. Additionally, some bags offer exceptional comfort, such as the Feathered Friends Egret UL 20 for women, although these options tend to be pricier. Budget bags, like the Brazos, may provide adequate warmth but lack the comfort and quality of premium sleeping bags.
When deciding between a sleeping bag and a mattress, it is essential to consider the specific needs and circumstances. Sleeping bags are an excellent choice for outdoor activities where portability and warmth are priorities. However, if comfort is the primary concern, especially for side sleepers, a mattress might be a better option. A good sleeping pad or mattress can provide a more comfortable and supportive surface, especially when paired with a blanket or quilt. Additionally, for warm environments, a sleeping bag liner might be a more comfortable and less sweaty alternative to a traditional sleeping bag.
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Mummy bags vs square bags
Mummy bags and square bags are the two most popular types of sleeping bags. They differ in shape, warmth retention, weight, and comfort.
Mummy bags are designed to maximise heat retention and save weight. They have a tapered form, wider at the shoulders and narrower at the feet, resembling a mummy’s shape. The close-fitting bag offers increased warmth in comparison to square sleeping bags, as there is less empty space to warm up. Mummy bags are lightweight and packable, making them a good choice for backpackers and hikers who need to save space. However, some people find them constricting, especially those who sleep on their sides, toss and turn, or sleep with one leg/knee pulled up to their chest.
Square bags, on the other hand, offer increased room and freedom of movement. They are rectangular from head to foot, allowing users to stretch and move with ease. Square bags are generally heavier and bulkier, making them less suitable for backpacking or hiking. They are more popular among car campers or for family camping. Square bags are often less expensive than mummy bags. Additionally, square bags can be unzipped and used as large quilts or picnic blankets, and multiple compatible square bags can be zipped together to create a large, double sleeping bag.
Ultimately, the choice between a mummy bag and a square bag depends on individual needs and preferences. If you plan to camp in colder weather or require a lightweight and packable option, a mummy bag may be the better choice. If you prioritise freedom of movement, comfort, and budget-friendliness, a square bag may be more suitable.
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Down filling vs synthetic filling
Sleeping bags are designed for camping outdoors or sleeping over at a friend's place. They are available in a wide array of shapes, sizes, materials, features, and prices. Sleeping bags are also designed for different applications, such as camping close to your car or backpacking long distances.
When it comes to sleeping bag fillings, down and synthetic fillings are the two main types. Down filling is made from the soft, fluffy, wispy filaments of plumage found underneath the exterior feathers of waterfowl such as ducks and geese. Synthetic filling, on the other hand, is typically made from polyester fibres that trap air to create a thermal barrier.
Down filling
Down sleeping bags offer a higher warmth-to-weight ratio than synthetic insulation. They are also lighter, as less down filling is required to achieve a certain temperature rating. For example, a sleeping bag rated +20°F with 700-fill-power down will be lighter than a +20°F bag using 600-fill-power down. However, down insulation tends to clump up and lose its insulation properties when it gets wet. Modern treatments have been developed to make down water-resistant, but it is still best to keep down-filled items dry. Down sleeping bags can also be compressed without causing structural damage, allowing them to retain consistent insulative power for 10+ years.
Synthetic filling
Synthetic sleeping bags are quick-drying and provide insulation even when wet. They tend to be less expensive, durable, and hypoallergenic. Synthetic fillings are available in short-staple and continuous filament varieties. Short-staple insulations feature densely packed fine-denier filaments that make the sleeping bags feel soft and flexible, similar to down-filled products. However, they are less durable and prone to creating cold spots as the insulation can move around. Continuous-filament insulations use thicker filaments that provide loft, strength, and durability. Synthetic fillings typically need replacement within 3 to 5 years as they break down faster.
Some manufacturers also offer hybrid sleeping bags that combine water-resistant down and synthetic insulation to provide the benefits of both materials.
When choosing between down and synthetic filling, consider factors such as weight, water resistance, compressibility, price, durability, and warmth-to-weight ratio.
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Budget vs premium
When it comes to budget vs premium sleeping bags, there are a few key factors to consider. Firstly, the materials used can greatly affect the comfort, durability, and price of a sleeping bag. Premium bags tend to use high fill-power down, which is extremely insulating for its weight, lightweight, compressible, and long-lasting. However, down is more expensive and does not retain insulating power when wet. In contrast, budget bags often use synthetic fills, which are more affordable, hypoallergenic, and moisture-resistant. Synthetic fills also provide a range of temperature ratings, with some bags suitable for warmer weather and others designed for colder conditions.
Another consideration is the design and features of the sleeping bag. Premium bags may offer more generous dimensions, allowing for a more comfortable fit and freedom of movement. They may also include additional features such as a draft collar or tube to seal out cold air and improve warmth. Budget bags, on the other hand, may have more basic designs and fewer features, but can still provide adequate comfort and functionality for occasional campers or those on a tighter budget.
For example, the Western Mountaineering MegaLite is a premium bag that utilizes 12 ounces of 850+ fill power to create a cozy and warm cocoon. It also offers more generous dimensions compared to other bags in its price range. In contrast, the Coleman Brazos is a budget-friendly option that provides a good balance of features, including an excellent zipper and ample shoulder room, at a fraction of the cost of premium bags.
Ultimately, the decision between a budget and a premium sleeping bag depends on individual needs and preferences. If you camp frequently and prioritize comfort, warmth, and lightweight gear, a premium bag may be worth the investment. However, if you only camp occasionally or prefer a more affordable option, a budget bag can still provide a comfortable and functional option without breaking the bank.
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Temperature ratings
Sleeping bags come with temperature ratings to help buyers choose the right product for their needs. These ratings are determined by standardised testing, such as the ISO Test and the EN 13537 standards. The ISO Test provides three temperature thresholds: Comfort, Limit, and Extreme. The Comfort rating indicates the temperature at which a cold sleeper might feel comfortable, while the Limit rating is for warm sleepers. The Extreme rating indicates the temperature at which a person could risk death from hypothermia.
The EN 13537 standards offer four different temperature ratings: Upper Comfort, Comfort, Lower Limit, and Extreme. Upper Comfort is the highest temperature at which a 70kg man should feel comfortable. Comfort is the temperature at which a 60kg woman can sleep comfortably through the night. The Lower Limit is the temperature at which a 70kg man can sleep for eight hours without waking. The Extreme rating is the same as the ISO test.
It's important to note that these ratings are estimates and may not perfectly match your experience. Factors such as clothing, gear, body type, weather conditions, and food can all impact how comfortable you feel in a sleeping bag. Additionally, the shape, features, and age of the sleeping bag can also affect its performance. For example, a roomier bag may sleep colder than its rating due to extra air space.
When choosing a sleeping bag, consider the lowest temperature you're likely to encounter and your personal internal thermostat. If you feel cold easily, opt for a bag with a Comfort rating that matches or is lower than the expected temperature. If you tend to sleep warm, you may rely on the Lower Limit rating, but it's still recommended to have a buffer of a few degrees Celsius.
Sleeping pads are also crucial for insulation and warmth. A good sleeping pad with an appropriate R-value will insulate you from the ground, ensuring you stay comfortable and warm.
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Frequently asked questions
Sleeping bags come in a wide range of shapes, sizes, materials, and features, so comfort will depend on the individual bag. Mummy bags, for example, are lighter and more compact but can be restrictive for some sleepers. Square bags are heavier and bulkier but allow for more freedom of movement. Some sleeping bags are designed with comfort in mind, such as the Feathered Friends Egret UL 20, which is specifically made for a women's fit.
A comfortable sleeping bag will have a good warmth-to-weight ratio, providing sufficient warmth without being too heavy. It should also be the right size for your body, with enough room to move around and find a comfortable position.
Sleeping bags alone will only add heat, not comfort. A good sleeping pad or mattress will provide better comfort than a sleeping bag alone.
Sleeping bag liners are a good alternative to sleeping bags, especially in warm weather. They are cheaper, more comfortable, and less sweaty than sleeping bags designed for colder temperatures.











































