Gina Johnson
When choosing a winter backpacking sleeping bag, it's important to consider various factors such as insulation type, temperature rating, weight, and additional features. The insulation type, typically down or synthetic, affects the bag's size, weight, and warmth. Down insulation is generally more durable, lightweight, and compressible but is more expensive and loses its loft when wet. Synthetic insulation stays warm when wet and is more affordable, but it doesn't compress as well as down. Temperature ratings indicate the lowest comfortable temperature for the bag, with “comfort” and “limit ratings for average cold sleepers and “warm sleepers, respectively. Weight is influenced by insulation type and shape, with more efficient insulations providing greater warmth for less weight. Additional features like stash pockets, anti-snag zippers, and pillow sleeves enhance comfort but add weight. The ideal size and weight of a winter backpacking sleeping bag depend on individual needs, balancing warmth, durability, and comfort.
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What You'll Learn
Insulation type: Down vs. Synthetic
When choosing a backpacking sleeping bag, one of the most important decisions you'll have to make is between down and synthetic insulation. Both have their pros and cons, and the right type of insulation for your use can turn a cold, uncomfortable outing into an enjoyable time outside.
Down insulation is made from the plumage found underneath the exterior feathers on waterfowl such as ducks and geese. It consists of soft, fluffy, wispy filaments. Down has a higher warmth-to-weight ratio than synthetic insulation, meaning you get more bang for your buck. It is also more durable than synthetic insulation and doesn't pack out as easily, so you’re likely to get more seasons out of a down bag. However, down insulation is more expensive and feathers and plumage tend to grow droopy and lose their loft when wet, thus losing their insulation properties.
Synthetic insulation, on the other hand, is typically made from polyester. It is quick-drying and continues to insulate even when wet. Synthetic insulation is also less expensive, durable, and hypoallergenic. However, synthetic insulation tends to be heavier and less compressible than down.
Some manufacturers make sleeping bags with a combination of water-resistant down and synthetic insulation. This hybrid construction can provide the benefits of both materials while limiting each material's imperfections.
When choosing between down and synthetic insulation, it's important to consider factors such as weight, compressibility, warmth, water resistance, and price. For example, if you're looking for a lightweight bag that packs down small, down insulation might be a better choice. On the other hand, if you're on a budget or anticipate being in wet conditions, synthetic insulation could be a better option. Ultimately, the best insulation type for a backpacking sleeping bag depends on your specific needs and priorities.
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Temperature ratings
When choosing a winter backpacking sleeping bag, one of the most important factors to consider is its temperature rating. This will ensure that you stay warm and comfortable during your outdoor adventures. Sleeping bag temperature ratings are determined through standardised laboratory tests, such as the ISO (International Standards Organization) and the older EN (European Norm) tests. These tests assign a temperature rating range to each bag, indicating the lowest temperature at which the bag will keep a person comfortable.
The ISO/EN tests differentiate between "comfort" and "limit" ratings. The "comfort" rating is the lowest temperature at which a "cold sleeper" would feel comfortable, and it is typically assigned to women's bags. The "limit" rating, on the other hand, is the lowest temperature at which a "warm sleeper" would be comfortable, and it is generally used for men's or unisex bags. These ratings provide a reliable way to compare different sleeping bags and choose the one suitable for your needs.
When selecting a winter backpacking sleeping bag, it is recommended to choose a bag with a temperature rating slightly lower than the coldest temperatures you anticipate encountering. This is because you can always open up the bag to cool down if the conditions are warmer. Additionally, consider the type of insulation, as it affects the bag's size and weight. Advanced synthetic insulation or high-fill-power down insulation will provide better warmth with less weight.
It is worth noting that temperature ratings are estimates, and the comfort level of a sleeping bag in real-world conditions may differ from its tested rating. Variables such as clothing, gear, body type, weather conditions, and individual metabolism can impact the actual warmth of a sleeping bag. Therefore, it is essential to consider other factors in addition to the temperature rating when choosing a winter backpacking sleeping bag.
Some people prefer to use a two-bag system, combining a warmer bag with a cooler bag to suit different seasons and weather conditions. This provides versatility and allows for a lighter setup during warmer months. Additionally, the cost of backpacking sleeping bags varies, with budget options available below $100 and high-end down bags reaching several hundred dollars. The more expensive bags tend to offer lighter weights, higher fill powers, and lower temperature ratings.
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Weight and packability
When it comes to backpacking sleeping bags, weight and packability are key considerations. You want a bag that is light enough to carry easily and packs down small enough so that it doesn't take over your pack, while also providing sufficient warmth and comfort for cold winter nights.
The weight of a sleeping bag is largely determined by its insulation and shape. Bags with advanced synthetic insulation or high-fill-power down offer greater warmth with less weight. Down insulation, in particular, is known for its superior warmth-to-weight ratio and compressibility. It also tends to be more durable than synthetic insulation, as it doesn't pack out as easily. However, down insulation has a significant drawback: it loses its loft when wet, rendering it unable to trap warm air. Synthetic insulation, on the other hand, continues to insulate even when wet. It is also generally more affordable.
When comparing the weight of sleeping bags, it's important to consider the insulation fill weight, which indicates how much insulation is in the bag. A bag with more insulation fill will typically provide more warmth. However, the overall bag weight is what matters most when carrying it in your pack. Additionally, keep in mind that extra features, such as internal sleeves, stash pockets, or anti-snag zippers, will add a small amount of weight.
To save weight, some backpackers opt for a two-bag system. This involves using a warmer bag for summer weather and a 20-degree bag for three-season trips. For winter trips, the two bags can be combined for added warmth. However, when it comes to winter backpacking, some adventurers prioritise warmth and comfort over weight, as a cold night can be miserable in a constricting bag.
In terms of packability, the compressed volume or stuffed size specifications can help you understand how much space a bag will take up in your pack. Down insulation typically offers better compressibility, especially in warmer bags with more down. Synthetic bags, on the other hand, don't compress as well, requiring more space in your pack. To improve packability, you can invest in a separate compression sack, which can help reduce the volume of your sleeping bag.
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Shape
The shape of a winter backpacking sleeping bag is an important consideration when selecting one to purchase. The shape of the bag will determine its weight and warmth, as well as its packed size.
The most common shape for a sleeping bag is the mummy shape, which is cut closely to the body's outline, with a tapered lower half that usually ends in a hood. This shape is designed to minimise the amount of dead air that needs to be warmed by the sleeper's body heat, thus making the bag warmer. Mummy bags are also often designed with a built-in pillow sleeve to keep your cushion in place throughout the night. The downside of this shape is that it can be constricting, which may be uncomfortable for those who move around a lot in their sleep.
Some sleeping bags have a wider cut in the middle, which makes it easier to change positions without feeling restricted. These are ideal for side sleepers or those who toss and turn. Some bags also have a wider cut at the hips, with an additional layer of synthetic fill that discourages the fabric from twisting.
Rectangular sleeping bags are also available, though they are less common. These bags are often designed for two people and have various zippers and vents to allow occupants to adjust their temperature and position without disturbing their partner.
The shape of the sleeping bag's hood is also important. A deep hood, similar to those found on winter parkas, will help to retain body heat. Some bags also have a draft collar, which further prevents heat loss.
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Additional features
When choosing a winter backpacking sleeping bag, it is essential to consider the additional features that can enhance your comfort and convenience. Here are some key features to look out for:
Temperature Rating: Select a sleeping bag with a temperature rating suitable for the winter conditions you anticipate encountering. Opt for a rating slightly lower than the expected low temperatures to ensure adequate warmth. The temperature rating indicates the lowest temperature at which the bag is designed to keep a sleeper warm. Bags with higher fill power, like the Feathered Friends Snow Goose ES -40, can provide exceptional warmth in extremely cold conditions.
Insulation Type: Choose between down and synthetic insulation. Down insulation provides superior warmth-to-weight ratios, is highly packable, and offers greater durability. It is ideal for winter conditions but tends to be more expensive. Synthetic insulation, on the other hand, maintains its insulating properties even when wet, making it a more affordable and casual option.
Weight and Packability: A good winter backpacking sleeping bag should be lightweight and packable, allowing for easy transport without taking up too much space in your pack. The weight of the bag is influenced by the insulation type and shape. Advanced synthetic fills and high-fill-power downs can provide greater warmth while minimising weight.
Comfort and Space: Look for features that enhance comfort, such as internal sleeves for camp pillows and sleeping pads, stash pockets for valuables, and anti-snag zippers. Additionally, consider the amount of space you require in the bag. Some bags, like the Western Mountaineering Bison Stormshield, offer generous sizing for added comfort during long winter nights.
Hood: A hood is an essential feature for winter backpacking sleeping bags as it helps retain body heat. Look for well-tailored hoods that provide a comfortable fit without feeling restrictive. The hood should integrate seamlessly with the overall design of the bag.
When selecting a winter backpacking sleeping bag, consider your personal sleep habits and preferences. Prioritise features that align with your specific needs, whether it's extra warmth, lightweight packability, or enhanced comfort during your outdoor adventures.
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Frequently asked questions
A good weight for a winter sleeping bag is generally considered to be in the range of 1 to 2 kilograms. Bags weighing 1 kilogram or less are considered on the lighter side, especially if they are designed for very cold temperatures. It's important to balance weight with other features such as warmth, durability, and comfort.
The weight of a winter backpacking sleeping bag is influenced by the type of insulation, temperature rating, size and shape of the bag, and the materials used. Down-filled bags tend to be lighter than synthetic-filled bags for the same level of warmth.
Some recommended winter backpacking sleeping bags include the Mountain Hardwear Phantom 0F, Enlightened Equipment Enigma Quilt 30, Feathered Friends Swallow UL, and Sea to Summit Spark. These bags offer a combination of warmth, weight, and build quality.
When choosing a winter backpacking sleeping bag, consider the temperature rating, type of insulation (down vs. synthetic), weight, and additional features. The temperature rating should be suitable for the anticipated low temperatures. Down insulation is generally warmer and more durable but more expensive, while synthetic insulation stays warm when wet. Additional features such as stash pockets, anti-snag zippers, and pillow sleeves can enhance comfort and convenience.
