Evie Summers
When choosing a sleeping bag, it's important to consider the materials used, as this will determine its warmth, weight, breathability, and comfort. Sleeping bags can be made from various materials, each with its own advantages and disadvantages. The two main types of insulation are down (animal feathers, usually goose or duck) and synthetic (such as polyester or fleece). Down sleeping bags are highly insulating, lightweight, and packable, but they are often expensive and require careful storage. Synthetic bags, on the other hand, are generally more affordable, water-resistant, and suitable for humid climates, but may be less breathable and prone to creating cold bridges. Other materials to consider include natural fibres like wool, which is biodegradable and renewable, and innovative blends like DownWool, a combination of down and wool. The choice of material also depends on the shape of the bag, with backpacking bags prioritizing lightweight and tapered designs, while camping bags offer more room to move around.
| Characteristics | Values |
|---|---|
| Temperature rating | 30°F, 20°F, 35°F, 20°C, -11°C, etc. |
| Shape | Rectangular, semi-rectangular, mummy, double, quilts |
| Insulation | Down, synthetic, advanced synthetics, high-fill-power downs |
| Fill weight | Higher fill weight indicates more fill in the bag, making it warmer |
| Water resistance | Waterproof/breathable membranes, water-resistant coatings, gore-tex outer bag |
| Size | Regular, long, short |
| Extras | Stash pockets, pad compatibility, hoods, draft-resistant zippers |
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$89.99
What You'll Learn
Insulation: Down vs. synthetic
Sleeping bags are designed to trap heat that is radiated from your body to the surrounding environment. The two main types of insulation that sleeping bags use are synthetic and down. Down insulation is made from animal feathers, most commonly goose or duck. Down is lightweight, durable, and packs down well, but it is more expensive. Down is also not ideal for humid climates, as wet down will not maintain warmth and is difficult to dry. However, recent innovations in dry down technology involve coating the filaments of the feathers in a hydrophobic layer, helping to keep the bag from getting damp.
Synthetic insulation, on the other hand, is made from materials such as polyester. Synthetic insulation is generally cheaper and performs better in humid and wet climates. Synthetic sleeping bags are also a good option for those who wish to avoid animal by-products. However, high-grade synthetics can outperform low-grade down, and may be more appropriate for extreme allergies or locations with significant moisture or potential condensation and ice buildup.
The weight of a sleeping bag is largely determined by its insulation and shape. More efficient insulations, like advanced synthetics and high-fill-power downs, deliver greater warmth for less weight. A bag with a sleek shape and a snug fit will be lighter than a similar bag that is roomier. The mummy shape, for example, boosts warmth and cuts weight by having a snug fit. Rectangular bags, on the other hand, are heavier and bulkier due to the extra material, and are less efficient at keeping you warm because of the dead space that needs to be heated.
When choosing a sleeping bag, it is important to consider the temperature rating. The temperature rating of a sleeping bag measures how efficiently the bag is able to retain heat, with lower temperature ratings indicating better heat retention. It is recommended to choose a sleeping bag with a rating slightly lower than the typical low temperatures you anticipate. Sleeping bags are also rated by seasons, with 1-season bags designed for summer camping, 2-season bags for late spring and early autumn, 3-season bags for autumn and early winter, 4-season bags for cold winter nights, and 5-season bags for extremely cold, polar conditions.
Understanding Sleeping Bag Temperature Ratings
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Temperature ratings
The temperature rating of a sleeping bag is an important factor in determining how well it will suit your needs. Sleeping bags are designed to trap the heat that your body radiates, and the temperature rating indicates the lowest temperature at which a bag will keep an "average sleeper" warm. Bags with lower temperature ratings are better at retaining heat and will maintain their insulating properties at lower temperatures.
It is important to note that temperature ratings are based on an "average sleeper" and do not account for individual factors such as metabolism, clothing, humidity, and wind. Therefore, it is recommended to choose a bag with a temperature rating slightly lower than the anticipated low temperatures during your camping or backpacking trips. Additionally, the shape of the bag also affects its warmth, with snug-fitting bags providing better insulation than roomier options.
The type of insulation also impacts the temperature rating. Bags with advanced synthetic insulation or high-fill-power down will provide greater warmth with less weight. Down insulation, made from animal feathers, is lightweight, durable, and packs down well but is more expensive and challenging to dry once wet. Synthetic insulation, on the other hand, is more affordable and suitable for humid and wet climates, although high-quality synthetic insulation can outperform low-grade down.
When selecting a sleeping bag, it is crucial to consider your planned activities and the anticipated temperatures. For backpacking, a lightweight bag with a lower temperature rating is ideal, while car camping allows for more flexibility in choosing a warmer and roomier bag. Trying out different bags and considering additional features, such as a snug-fitting hood or water-resistant shell, will also help ensure you find the right sleeping bag for your needs.
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Weight and bulk
When it comes to weight and bulk, there are several factors to consider when choosing a sleeping bag. Firstly, the insulation type and shape of the bag play a significant role in its weight. More efficient insulations, such as advanced synthetics and high-fill-power downs, provide greater warmth with less weight compared to less efficient fills. Therefore, it is important to compare bags with similar temperature ratings when considering weight. The overall bag weight is crucial if you plan to carry it in a pack, as a lighter bag will be easier to transport.
The shape of the sleeping bag also affects its weight. A bag with a sleek and snug fit will be lighter than a roomier option. For example, the mummy-shaped bag is designed to be snug, reducing weight while maximising warmth. On the other hand, rectangular bags tend to be heavier and bulkier due to the extra material required, but they offer more room to move around. If you prioritise having space to stretch out, a rectangular bag may be a suitable trade-off despite the increased weight and bulk.
Additionally, the size of the sleeping bag can impact its weight. Generally, a smaller bag will be slightly lighter and more compact, helping you save weight and space. This is particularly important if you are backpacking and have limited carrying capacity. It is worth noting that women's sleeping bags are typically shorter, narrower at the shoulders, and wider at the hips compared to men's or unisex bags, offering a more customised fit.
The weight of a sleeping bag is also influenced by its temperature rating. Bags with lower temperature ratings are designed for colder conditions and tend to have more insulation, making them heavier. If you anticipate colder temperatures during your outdoor adventures, opting for a bag with a lower temperature rating will provide more warmth, but it will likely be heavier. Conversely, if you plan to camp in milder climates, a bag with a higher temperature rating will be lighter and more breathable.
Lastly, the type of insulation affects the weight and bulk of a sleeping bag. Down insulation, made from animal feathers, is known for being lightweight, durable, and highly compressible, making it ideal for backpacking. However, down insulation is more expensive and requires careful maintenance, as wet down loses its insulating properties and is challenging to dry. On the other hand, synthetic insulation is generally more affordable and performs well in humid and wet climates. Synthetic fillings are also a good option if you prioritise ethical considerations, as down insulation uses animal by-products.
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Shape and fit
The shape and fit of a sleeping bag are crucial factors to consider when making a purchase decision. Sleeping bags come in various shapes, including rectangular, semi-rectangular or "modified mummy", and mummy. Rectangular bags offer ample room for legs and arms to stretch out and can even be unzipped to be used as blankets. They are ideal for recreational camping or car camping where weight and space are not a concern. However, their extra material makes them heavier and bulkier, and they are less efficient at retaining heat.
Semi-rectangular bags offer a compromise between warmth and roominess. They are suitable for those who want more space than a traditional mummy bag but still prioritise warmth. Mummy bags, on the other hand, have a snug fit to boost warmth and reduce weight. With this style, you roll over with the bag rather than inside it. Mummy bags are ideal for backpacking or camping in colder climates as they are lightweight and efficient at retaining heat.
It's important to consider the size of the sleeping bag in relation to your body. Most bags come in regular and long sizes, with some offering a short option. If you're between sizes, it's recommended to try both and choose the one that feels most comfortable. Generally, opting for a smaller size can save weight and provide more warmth. Additionally, women's sleeping bags are designed with specific contours in mind, featuring narrower shoulders and wider hips.
The fit of the sleeping bag also affects its warmth. A bag with extra room will take longer to warm up as your body needs to heat the air inside. Therefore, it's essential to find a balance between wiggle room and warmth retention. A snug-fitting hood can also increase the warmth of a sleeping bag, making it ideal for colder environments.
When choosing a sleeping bag, it's worth trying different styles in-store to determine which shape and size suit your preferences and requirements. Considering factors like weight, packability, warmth, and comfort will help you select the right sleeping bag for your outdoor adventures.
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Water resistance
There are a few sleeping bags on the market that are highly water-resistant, with a shell that incorporates a waterproof membrane such as Gore-Tex. Examples include the Mountain Equipment Snowline, Redline, and Iceline bags, as well as the Mountain Hardwear Phantom series. However, even these bags are not fully waterproof due to their lack of taped seams. These bags are designed for extreme climates such as high-altitude mountaineering or polar expeditions, and may be overkill for standard wild camping.
Synthetic sleeping bags have the advantage of maintaining considerable insulation when wet, as the synthetic fibres do not clump together like down feathers. Many bags have some type of light water repellence, but it is still best to avoid getting any sleeping bag wet. If you plan to camp in humid and wet climates, synthetic insulation is probably a better choice than a down bag, even if it has water-resistant down.
You can increase the water resistance of your sleeping bag by using a plastic bag or a lightweight rescue blanket over the end of the bag, or by using waterproofing sprays. However, keep in mind that waterproofing treatments may reduce the breathability of the bag, which is important to prevent moisture vapour from becoming trapped in the bag.
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Frequently asked questions
Sleeping bags are made of a variety of materials, and the best material for you depends on your needs. The two main types of insulation are down (animal feathers, usually goose or duck) and synthetic (such as polyester). Down is better for dry climates, while synthetic is better for humid and wet climates. Synthetic bags are usually cheaper, but down bags are more lightweight and compressible.
You should also consider the shape of the sleeping bag. Rectangular sleeping bags are the most common for camping because they are the most comfortable and allow you to sleep in a natural position, but they are heavier and bulkier. Mummy bags are tapered to minimize material and maximize thermal efficiency, making them better for backpacking.
Sleeping bag temperature ratings represent the lowest temperature at which the bag can be used. Bags with lower temperature ratings are better at trapping heat and will keep you warmer. However, you should also consider the environment you will be sleeping in, as other factors like sleeping pads, clothing, humidity, and wind can affect how warm you feel.
