
There are many factors to consider when choosing a sleeping bag. Sleeping bags are not one-size-fits-all, and the right one for you will depend on your individual needs and preferences. Some key considerations include the type of insulation, the bag's shape and size, its temperature rating, and any extra features. Other factors that can influence your decision include your budget, the climate you'll be using it in, and whether you need a bag for car camping or backpacking.
| Characteristics | Values |
|---|---|
| Purpose | Backpacking or camping |
| Temperature | Based on the lowest expected temperature; bags have "comfort", "limit" and "extreme" ratings |
| Insulation | Down or synthetic; down is more expensive, lighter, compressible and durable, but synthetic insulates better when wet |
| Shape | Mummy, semi-rectangular, rectangular, double or kids' |
| Size | Regular or long |
| Gender | Unisex, men's or women's (women's bags tend to have more insulation) |
| Price | From budget to premium |
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What You'll Learn

Sleeping bag shapes
Sleeping bags come in a variety of shapes, each with its own advantages and disadvantages. The three basic shapes are rectangular, semi-rectangular (or "modified mummy"), and mummy.
Rectangular sleeping bags offer plenty of room for both legs and arms to stretch out. Some can be completely unzipped and used like a comforter, making them a good choice for warm-weather camping. They are also available in double sizes for couples or can be zipped together if they are the same model and brand.
Semi-rectangular sleeping bags, also known as "modified mummy" or "barrel" bags, offer a compromise between warmth and roominess. They are generally more slender than rectangular bags, with a rounded top and a slight taper at the bottom. This shape is well-suited for cool-weather camping when conditions are chilly but not frigid.
Mummy sleeping bags are designed to boost warmth and reduce weight. They have a slim cut and a contoured hood that can be cinched tight for greater warmth. The overall fit is snug, and you typically roll over with the bag rather than inside it. This shape is popular for backpackers as it is lighter and more packable than other shapes.
In addition to these three basic shapes, there are also women's sleeping bags, which are engineered to more closely fit a woman's contours. They are typically shorter, narrower at the shoulders, and wider at the hips than a men's or unisex bag. Women typically sleep colder than men, so women's sleeping bags usually have more conservative temperature ratings and may incorporate extra insulation.
Kid's sleeping bags are also available and are simply shorter, smaller, and more affordable variations of adult sleeping bags. They come in various shapes, including mummy, rectangular, and semi-rectangular, and often feature fun prints, patterns, and colors.
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Insulation types
The insulation type of a sleeping bag is an important consideration when choosing one to buy. The two main types of insulation are down and synthetic. Down insulation is made from the feathers of ducks and geese. It is more expensive, lighter, and more compressible than synthetic insulation. Down is also more durable and retains warmth better over time. However, down loses its insulating power when it gets wet, as the feathers clump together and lose their loft.
Synthetic insulation, on the other hand, is made from polyester fibres. It is cheaper than down, but not as warm for an equal weight of material. Synthetic insulation has the advantage of maintaining its insulating properties when wet, as the fibres do not clump together like feathers do. Synthetic bags also vary in quality, with more basic bags using flat layers of insulation, and better-quality bags using layers sewn diagonally over one another, a construction known as
When choosing a sleeping bag, it is important to consider the type of insulation and its distribution within the bag. Down bags typically use baffled constructions, while synthetics use quilted or shingled constructions. The goal is to distribute the insulation evenly to avoid cold spots. It is also worth noting that some bags use a combination of down and synthetic insulation, with synthetic insulation on the bottom to reduce compression and down on top to loft better. Additionally, the shape of the bag can impact its insulating properties, with mummy bags being narrower at the feet to reduce the space that needs to be warmed.
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Temperature ratings
The temperature ratings of sleeping bags are based on standardised tests, which give a more precise and comparable system than a season rating alone. The ISO test, for instance, provides three temperature thresholds: a comfort rating, a limit rating, and an extreme rating. The comfort rating indicates the temperature at which a cold sleeper might feel comfortable. This is the rating used for women's bags. The lower limit rating, which is always lower than the comfort rating, indicates the temperature at which a warm sleeper might still feel comfortable. This is the rating used for men's bags. It's important to note that temperature ratings are estimates, and while standardised tests ensure that all bag tests are done the same way, they can't account for individual variations.
The EN rating system is another standardised test that determines the warmth of a sleeping bag. Similar to the ISO test, it also produces a lower rating for male sleepers and a comfort rating for female sleepers. The EN 13537 standard offers four different temperature ratings: EN Upper Comfort, EN Comfort, EN Lower Limit, and EN Extreme. The EN Upper Comfort rating is the highest temperature at which an average man weighing 70 kg should feel comfortable. The EN Comfort rating is the temperature at which an average 60 kg female can sleep comfortably through the night. The EN Lower Limit rating is the temperature at which an average man can maintain his thermal equilibrium in a curled-up position. The EN Extreme rating is the lowest temperature at which the sleeping bag will provide protection from frostbite or hypothermia.
It's worth noting that not every sleeping bag has an ISO or EN rating. These standardised tests don't apply to bags designed for extreme cold or children's bags. Additionally, brands might not choose to obtain ISO or EN testing for bags intended for mild conditions or casual use. In such cases, the temperature ratings reflected on the bag are likely the brand's estimates rather than the result of standardised testing.
When choosing a sleeping bag based on temperature ratings, it's essential to consider your personal preferences and internal thermostat. If you frequently feel cold, opt for a bag rated for colder temperatures. On the other hand, if you tend to feel warm, you may choose a bag with a higher temperature rating. Additionally, factors like the shape, features, and age of the sleeping bag, as well as the quality and amount of down, can also impact its warmth and overall performance.
Finally, it's worth mentioning that the temperature ratings on sleeping bags are meant to provide a guideline rather than an exact temperature range. Individual factors, such as the person's body temperature, the fit of the bag, and whether they sleep hot or cold, can all influence their comfort level. Therefore, it's recommended to read reviews and consider multiple factors when selecting a sleeping bag that best suits your needs.
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Backpacking vs camping bags
Sleeping bags are designed for different purposes and conditions, and they are not all the same. When choosing a sleeping bag, it is important to consider the activity it will be used for, the temperature rating, the insulation type, and the shape.
Backpacking sleeping bags are designed to be lightweight and easily packable, as they need to be carried in a backpack over long distances. They are more snug and fit closer to the body to reduce weight and increase warmth. The outer shell of a backpacking bag is typically made of ripstop nylon or polyester and treated with a durable water repellent (DWR) finish to prevent moisture from seeping through. When choosing a backpacking bag, weight and compressibility are the main considerations, and it is important to balance these factors with the correct level of warmth by considering the temperature rating.
On the other hand, camping sleeping bags are designed for comfort and roominess. They are typically larger and bulkier, making them ideal for car camping or front-country excursions. Camping bags often have a rectangular shape, allowing ample space to move around and roll over. Since weight and packability are not as important for camping bags, they can be heavier and more affordable. When choosing a camping bag, the main consideration is the temperature rating, ensuring it is suitable for the expected nighttime temperatures.
In terms of insulation, both backpacking and camping sleeping bags offer options such as down fill or synthetic fill. Down insulation provides superior warmth for its weight, while synthetic insulation is cheaper and has better insulating ability when wet. However, synthetic insulation can clump together when wet, reducing its insulating power.
It is worth noting that the distinction between backpacking and camping bags is not absolute, and some bags may have features of both types. Additionally, factors such as sleeping pads, sleeping clothes, humidity, and metabolism can also affect how warm or comfortable you feel while using a sleeping bag.
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Fit and sleep requirements
The right sleeping bag for you will depend on your fit and sleep requirements. Sleeping bags come in a variety of shapes, including mummy, semi-rectangular, rectangular, and double. Mummy-style bags are tapered and snug, which cuts down on weight and increases warmth, making them ideal for backpackers. Rectangular bags, on the other hand, provide extra room and allow you to stretch out, making them a popular choice for car camping. Semi-rectangular bags, also known as "modified mummy" or "barrel" bags, offer a compromise between warmth and roominess. For couples, double sleeping bags are ideal, although rectangular bags can also be zipped together if they are the same model and brand.
When it comes to fit, sleeping bags generally come in regular or long sizes, with men's and women's sizes differing in length. Women's bags are often designed with wider hip and narrower shoulder dimensions, and they usually have more conservative temperature ratings as women typically sleep colder than men. It's important to consider your sleep preferences, such as whether you are a cold or hot sleeper, a side or back sleeper, and whether you tend to rotate a lot in your sleep. If you are a restless sleeper, you may prefer a model that provides a more stabilized sleep system, while a simple, high-quality bag might be best if you value simplicity and quality.
Temperature ratings are an important consideration, as you want a bag that will keep you comfortable in the temperatures you plan to camp in. Most bags have a "comfort" rating for cold sleepers and a "lower limit" rating for warm sleepers. Summer-specific bags are typically rated at 30 degrees Fahrenheit and above, three-season bags range from 15 to 30 degrees, and winter or cold-weather bags are rated below 15 degrees. It's recommended to pick a bag with a lower temperature rating than the lowest nighttime temperature you expect, as you can always unzip the bag if you get too warm. Keep in mind that temperature ratings are based on an "average sleeper" and do not account for individual factors such as metabolism and sleepwear.
In addition to temperature ratings, the type of insulation is an important consideration. Sleeping bags typically use down or synthetic insulation. Down insulation is more expensive, lighter, more compressible, and more durable, providing consistent warmth over a long period. It is measured by fill power, which indicates the quality of down—the higher the number, the higher the loft and the better the warmth-to-weight ratio. Synthetic insulation is cheaper and has the advantage of greater insulating ability when wet, as down feathers lose their insulating power when they get wet. However, down is still preferred by many backcountry travelers due to its weight savings and packed size advantages.
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Frequently asked questions
Sleeping bags come in various shapes, including rectangular, semi-rectangular, and mummy. Rectangular bags are the most common and provide ample room to stretch out and roll over. Semi-rectangular bags, also known as "modified mummy" or "barrel" bags, offer a compromise between warmth and roominess. Mummy bags, on the other hand, have a snug fit to boost warmth and reduce weight.
There are several factors to consider when selecting a sleeping bag. Firstly, determine who will be using the bag and their individual sleep preferences, such as whether they sleep cold or hot, and their sleeping position. Next, consider the conditions in which the bag will be used, including temperature and climate. Other factors to keep in mind include the type of insulation, weight, extra features, and your budget.
Down insulation, derived from the underbelly of ducks and geese, provides superior warmth-to-weight ratio and compressibility. It is typically more expensive and durable, retaining consistent warmth over decades with proper care. Synthetic insulation, while cheaper, has a greater insulating ability when wet. Synthetic fibres do not clump when wet, maintaining their insulating properties.
When selecting a sleeping bag based on temperature rating, consider the lowest nighttime temperature you expect to encounter. Choose a bag with a rating slightly lower than this temperature as you can always unzip the bag if it feels too warm. Keep in mind that temperature ratings are based on an "average sleeper" and may not account for individual differences in metabolism and sleep habits.
Yes, double sleeping bags are designed for couples who want to sleep together in the same bag. These bags provide ample space for two people and often feature integrated pads and draft tubes to retain heat. Alternatively, you can opt for rectangular sleeping bags designed to zip together, ensuring they are the same model and brand.











































