Herbie Murray
When it comes to ordering a sleeping bag, there are a few things to consider. Firstly, decide what activity you need the bag for, as this will determine the most suitable type in terms of weight, shape, and features. For example, a sleeping bag for camping can be more spacious and comfortable, whereas a bag for backpacking needs to be lightweight and compact. Sleeping bags also come in different shapes, with rectangular, semi-rectangular, and mummy styles being the most common, each offering varying levels of warmth and roominess. Other factors to consider include temperature ratings, insulation types, and additional features such as draft-resistant zippers, water resistance, and hoods. With a wide range of options available, it's important to prioritize your requirements to make an informed decision.
| Characteristics | Values |
|---|---|
| Purpose | Camping, backpacking, mountaineering, packrafting, etc. |
| Temperature rating | Based on the lowest temperature of usage. |
| Insulation type | Down or synthetic. |
| Bag shape | Rectangular, semi-rectangular, mummy, double, etc. |
| Size | Regular, long, short, wide, etc. |
| Additional features | Well-fitting hoods, draft-resistant zippers, water-resistance, stash pockets, etc. |
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What You'll Learn
- Sleeping bag shapes: rectangular, semi-rectangular, mummy, and double
- Temperature ratings: choose a bag with a lower rating than the lowest temp you expect
- Insulation types: down or synthetic
- Weight and compressibility: consider how you'll transport your bag
- Size: review the bag's size specs to find the right fit
Sleeping bag shapes: rectangular, semi-rectangular, mummy, and double
Sleeping bags come in various shapes, each catering to different sleeping styles and outdoor scenarios. The three basic shapes are rectangular, semi-rectangular (or modified mummy), and mummy. Some sleeping bag makers also offer double sleeping bags.
Rectangular sleeping bags offer plenty of room for both legs and arms to stretch out. They are ideal for people who move a lot in their sleep or like to sleep in different positions. They are usually heavier and bulkier, making them more suitable for car camping than hiking or backpacking. Rectangular sleeping bags can sometimes be completely unzipped and used as a comforter.
Semi-rectangular sleeping bags, also known as modified mummy or barrel-shaped bags, offer a compromise between warmth and roominess. They are a good option for those who want more space than a traditional mummy bag but still want the benefits of improved heat retention.
Mummy sleeping bags have a tapered form, wider at the shoulders and narrower at the feet. This shape helps retain heat more efficiently as there is less empty space to warm up, making them suitable for cold-weather camping and mountaineering. Mummy bags are also more lightweight and packable, making them a popular choice for backpackers and hikers. However, some people may find the snug fit restrictive or uncomfortable.
Double sleeping bags are designed for couples and are typically made by zipping two individual bags together. They need to be the same model and brand to ensure compatibility. Standard double sleeping bags can be large and heavy, so they are not ideal for backcountry camping.
When choosing a sleeping bag shape, consider your sleeping style, the outdoor conditions you'll be using it in, and whether you need to prioritise warmth, weight, or roominess.
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Temperature ratings: choose a bag with a lower rating than the lowest temp you expect
When choosing a sleeping bag, it is important to consider the temperature rating. This is the temperature at which the bag will keep you warm. Since there are many variables that a lab cannot simulate, the real-world comfort provided by a sleeping bag may not match its lab-tested temperature rating. Therefore, it is a good idea to choose a bag with a lower rating than the lowest temperature you expect to encounter. This will ensure that you stay warm and comfortable throughout the night.
Sleeping bags are typically tested according to the International Organization for Standardization standard, using ISO 23537 (also known as "the ISO Test"). The test involves placing an electronic mannequin, dressed in long underwear, inside the sleeping bag, which is placed on 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. If a lot of energy is required to keep the mannequin warm, the bag is considered less warm.
It is important to note that temperature ratings are based on an "average sleeper" and may not account for individual differences in metabolism, clothing, gear, body type, and other factors. For example, women's sleeping bags tend to have more insulation and are rated for temperatures that are 10-15 degrees Fahrenheit warmer than similarly rated men's bags, as women tend to sleep colder than men. However, these are generalisations, and it is important to choose a bag that aligns with your personal comfort preferences.
When selecting a sleeping bag, it is also worth considering the type of activity you will be using it for. If you will be backpacking, a lightweight and packable bag is ideal. On the other hand, if you will be car camping, you have more flexibility to choose a warmer and roomier bag without worrying about bulk or weight. Additionally, consider the shape of the sleeping bag, such as rectangular, semi-rectangular, or mummy, as this will impact the warmth and roominess of the bag.
By taking into account the expected temperatures, your personal comfort preferences, and the intended activity, you can choose a sleeping bag with a temperature rating that will ensure a cosy and enjoyable night's sleep during your outdoor adventures.
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Insulation types: down or synthetic
When choosing a sleeping bag, one of the most important decisions you'll have to make is the insulation type. The insulation type directly affects the warmth, weight, water resistance, compressibility, and price of sleeping bags. The two most common types of insulation are down and synthetic.
Down insulation is made from the soft, wispy plumage found underneath the exterior feathers of waterfowl, such as geese and ducks. Down sleeping bags are favoured by backpackers due to their light weight and unbeatable warmth-to-weight ratio. It takes much less down than synthetic material to fill the same area because it lofts more. Down sleeping bags are also more likely to keep you warm for longer, even decades if properly cared for. However, the biggest drawback of down is its inability to insulate once it gets wet. Compressed areas in down sleeping bags can also create cold spots.
Synthetic insulation, on the other hand, is perfect for car camping since it's much cheaper and weight and packed size are less important. Synthetic sleeping bags are also good for those who are just starting out with camping or backpacking. Synthetic insulation is also very water-resistant and continues to insulate even when wet. However, synthetic sleeping bags tend to be stiffer and less compressible than down sleeping bags.
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.
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Weight and compressibility: consider how you'll transport your bag
When choosing a sleeping bag, it's important to consider how you'll be transporting it. If you're car camping, you don't need to worry about weight or bulk, and you can choose the warmest, roomiest bag within your budget. On the other hand, if you're backpacking or hiking, weight and compressibility become crucial factors. Every ounce counts when you're carrying your gear on your back over long distances, and a heavy sleeping bag can quickly lead to fatigue.
To minimize weight and maximize space efficiency, look for a lightweight, compressible sleeping bag. Mummy bags are a popular choice for backpacking as they are designed to fit closely to the body, reducing the amount of air space inside the bag and saving weight. Rectangular bags, on the other hand, offer plenty of room to stretch out but are bulkier and heavier.
The insulation material also plays a significant role in weight and compressibility. Down insulation, derived from duck and goose feathers, is known for its superior warmth-to-weight ratio and compressibility. It is lightweight and highly compressible but tends to be more expensive and loses insulating properties when wet unless treated. Synthetic insulation, such as polyester, is more affordable and performs better when wet, but it is generally heavier and less compressible than down.
When selecting a sleeping bag, it's essential to balance weight with warmth and comfort. A sleeping bag that is too light may not provide sufficient warmth, compromising your comfort and safety. Therefore, it's crucial to consider the expected weather conditions and your sleep preferences when choosing between down and synthetic insulation. Additionally, don't forget to test the bag before your trip to ensure it fits comfortably and provides the necessary warmth.
By considering weight, compressibility, insulation type, and your personal needs, you can choose a sleeping bag that is easy to transport and ensures a good night's rest during your outdoor adventures.
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Size: review the bag's size specs to find the right fit
When it comes to choosing the right size for your sleeping bag, there are three important dimensions to consider: length, shoulder girth, and hip girth. The better a sleeping bag fits, the warmer it will be. This is because a properly fitting sleeping bag minimises the amount of air space around your body, which reduces the amount of air you need to heat and keeps you warmer for longer.
Firstly, consider the length. Sleeping bags are sized by their length, so the correct length for your bag should correspond with your height. Men’s sleeping bags typically come in two standard lengths: regular (for people up to 6 feet in height) and long (up to 6 feet 6 inches). A short version is sometimes available, which usually fits people up to 5 feet 6 inches. Women’s bags also come in regular and long, but the measurements are different: up to 5 feet 4 inches and 5 feet 10 inches, respectively. Generally, it is recommended that you opt for the shortest length sleeping bag that fits you to minimise extra room and maximise warmth.
Next, consider shoulder girth, which is the circumference of the sleeping bag across the shoulders. Most men’s sleeping bags have a shoulder girth of between 60 and 64 inches, while women’s sleeping bags are usually slightly narrower, ranging from 56 to 60 inches. The easiest way to determine your preferred shoulder girth is to test several sleeping bags of different dimensions to find the most comfortable fit.
Finally, consider hip girth, which is the circumference of the sleeping bag across the hips. Hip girth varies primarily based on whether the bag is designed for men or women. Most men’s bags feature a hip girth of around 58 inches, while women’s bags are often slightly wider, at up to 60 inches. Again, the best way to find your preferred hip girth is to try out several different models.
It's important to note that each brand and model of sleeping bag will fit differently, so it's a good idea to try out different bags to see which styles feel most comfortable for you.
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Frequently asked questions
Camping sleeping bags are usually designed to be comfortable and spacious. You can choose any shape you like, but rectangular sleeping bags give the most space to move around. You can also choose any fill you like, but note that down lasts longer than synthetic fills but is more expensive.
For backpacking, you'll want a sleeping bag that is lightweight and compressible. Down sleeping bags are recommended for this purpose.
Sleeping bags come in three basic shapes: rectangular, semi-rectangular (or modified mummy/barrel shape), and mummy. Rectangular bags allow plenty of room for the legs and arms to stretch out. Semi-rectangular bags offer a compromise between warmth and roominess. Mummy bags are snug to boost warmth and cut weight.
The REI Co-op Siesta Hooded 20 Sleeping Bag is a popular choice for car camping. It has a classic rectangular shape, giving sleepers plenty of room to move around.
If you're on a budget, you can opt for a less technical sleeping bag. The Coleman Brazos for car camping and the Mountain Hardwear Bishop Pass 15 for backpacking are good budget options.
