Colin Snow
When choosing a sleeping bag, it's important to consider the temperature rating, insulation type, bag shape, and extra features. The ideal sleeping bag should offer ample room to stretch out and roll over, and its temperature rating should be slightly lower than the lowest anticipated nighttime temperature. For backpacking, the lightest and most packable bag within your budget is recommended, whereas car camping allows for more spacious and plush options. Sleeping bags come in various shapes, including rectangular, semirectangular or modified mummy, and mummy, each offering different levels of warmth and roominess. Insulation type, such as down or synthetic, is another critical factor, with down providing superior warmth-to-weight ratios but losing insulating properties when wet, whereas synthetic insulation remains effective in damp conditions. Additional features like stash pockets, sleeping pad compatibility, and well-fitting hoods can also enhance your sleeping bag experience.
| Characteristics | Values |
|---|---|
| Temperature rating | Choose a bag rated slightly lower than the lowest temperature you expect to encounter. Summer bags have a rating of 30°F and higher, 3-season bags are between 15°F and 30°F, and winter bags are 15°F and lower. |
| Insulation type | Down has a better warmth-to-weight ratio and is more packable, but loses its insulating properties when wet. Synthetic insulation is more affordable, dries quickly, and is better for damp climates. Down-synthetic blends are also available. |
| Bag shape | Rectangular bags offer more room to move around, semi-rectangular bags offer a compromise between warmth and roominess, and mummy bags are snug and maximise thermal efficiency. Double bags are available for couples. |
| Weight | For backpacking, choose the lightest bag within your budget. |
| Size | Bags for women are cut differently to unisex bags, with narrower shoulders, wider hips, and shorter lengths. |
| Zipper | Choose a left or right-hand zip based on your dominant hand. Bags with the same zipper type can be zipped together. |
| Storage | Look for a stash pocket to store small items. |
| Sleeping pad compatibility | Some bags have a sleeve to fit a sleeping pad, or pad loops to attach a pad using straps. |
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What You'll Learn
- Temperature ratings: Go for a lower rating than the lowest temperature you'll encounter
- Shape: Rectangular, semi-rectangular, mummy, or double are the most common
- Fill type: Down is best for warmth, but synthetic is cheaper and dries quicker
- Weight: For backpacking, the lighter the better
- Accessories: Look for stash pockets, sleeping pad compatibility, and storage sacks
Temperature ratings: Go for a lower rating than the lowest temperature you'll encounter
When choosing a sleeping bag, it is important to consider the temperature rating, which represents the lowest temperature at which a sleeping bag can be used. For example, a 35°F bag will keep you warm down to around 35°F, and below that, you will start to feel uncomfortably cold.
If you plan to camp in a cold environment, it is advisable to select a sleeping bag with a lower temperature rating than the lowest anticipated nighttime temperature. This is because temperature ratings are based on an "average sleeper" and do not account for individual differences, such as metabolism, or external factors like humidity and wind. By choosing a bag with a lower temperature rating, you can ensure that you will stay warm enough during your camping trip.
The type of insulation also plays a crucial role in the warmth of a sleeping bag. Down insulation, made from bird feathers, typically has a higher warmth-to-weight ratio and is lighter and more compressible than synthetic insulation. However, down loses its insulating properties when wet and takes a long time to dry. On the other hand, synthetic insulation is more affordable, retains warmth better in wet conditions, and dries quickly. If you anticipate camping in damp environments or snowy conditions, a synthetic sleeping bag may be a better option.
The shape of the sleeping bag also affects its warmth. Mummy-shaped bags are snug and maximise thermal efficiency, making them ideal for backpacking and cold climates. Rectangular bags, on the other hand, offer more room to move around but may not retain heat as well, making them more suitable for car camping or warmer weather.
In addition to temperature ratings, insulation, and shape, other features such as well-fitting hoods, draft-resistant zippers, and stash pockets can also enhance the functionality and comfort of a sleeping bag. It is important to consider your specific needs and preferences when selecting a sleeping bag to ensure a good night's sleep during your outdoor adventures.
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Shape: Rectangular, semi-rectangular, mummy, or double are the most common
When choosing a sleeping bag, it's important to consider its shape as this will impact your comfort and warmth. The four most common sleeping bag shapes are rectangular, semi-rectangular, mummy, and double.
Rectangular sleeping bags are the traditional blanket-like shape, offering a roomy interior that allows for greater freedom of movement. They are ideal for campers who prioritise comfort and space over warmth as they do not retain as much heat due to the larger amount of material and insulation. Rectangular bags are also heavier and bulkier, making them less ideal for backpacking or hiking where pack weight and space are critical factors. However, they can be unzipped and used as a comforter if the weather is unexpectedly warm.
Semi-rectangular sleeping bags are similar to mummy-shaped bags but do not completely conform to the shape of your body. They aim to find a balance between warmth and roominess, making them well-suited for cool-weather camping. They have a slightly tapered shoulder area to prevent draughts while providing more room around the feet. This style is a good option for those who need more warmth than a rectangular bag but find the mummy-shaped bag too restrictive.
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. Mummy bags are also lightweight and packable, taking up less space, which is advantageous for backpackers and hikers. However, the trade-off is restricted internal space, which can be uncomfortable for side sleepers or those who move around a lot during sleep. Mummy bags often include a hood for additional warmth.
Double sleeping bags are designed for two people and provide ample space for a couple or a close friend. They mostly come in a rectangular form, offering freedom of movement but lacking the insulating capacity for cool-weather camping. Some double bags can be converted into single bags with a midway zip.
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Fill type: Down is best for warmth, but synthetic is cheaper and dries quicker
When it comes to choosing a sleeping bag, one of the most important considerations is the type of fill or insulation. The two main types of fill are down and synthetic, each with its own advantages and drawbacks.
Down insulation, made from a bird's plumage found under its feathers, typically those of geese or ducks, is generally considered the best option for warmth. It has an excellent weight-to-warmth ratio and is highly compressible, making it ideal for lightweight backpacking or camping in cold and dry climates. Down-filled sleeping bags are usually lighter and more packable than their synthetic counterparts. The quality of down is indicated by its fill power rating, which ranges from 600 to 900. The higher the fill power, the warmer the bag, and the better it retains its loft over time.
However, one significant drawback of down is its performance in wet conditions. Down loses its insulating properties when it gets wet and takes a long time to dry. Therefore, if you plan to camp in damp environments or snowy conditions, a synthetic bag might be a better choice.
Synthetic insulation, often made from polyester, offers several benefits. It continues to insulate when wet, making it suitable for humid or wet climates. Synthetic bags are generally more affordable than down bags, and they dry much quicker. Synthetic insulation is also a good option for camping on snow, as it provides warmth even when wet. Additionally, some synthetic bags can be packed down to a small size, making them somewhat comparable to down bags in terms of packability.
However, synthetic bags do have some drawbacks. They tend to be heavier and bulkier than down bags, which can be a challenge when backpacking or hiking. Additionally, synthetic insulation gradually loses its warmth over time, especially when compressed, so you may find that your synthetic bag becomes less effective at retaining heat with extended use.
Ultimately, the decision between down and synthetic fill comes down to your specific needs and preferences. If you prioritise warmth, lightweight, and compressibility, down is an excellent choice. However, if you require a sleeping bag that performs well in wet conditions and offers a more affordable option, synthetic insulation might be the right choice for you.
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Weight: For backpacking, the lighter the better
When it comes to backpacking, weight is a crucial factor to consider when choosing a sleeping bag. You'll be carrying your gear on your back, so it's important to minimise weight and bulk wherever possible. The ideal backpacking sleeping bag should be lightweight and snug, allowing you to move through your adventures with ease.
The weight of a sleeping bag is largely determined by two factors: the quality of its insulation and the cut of the bag. Down insulation, made from a bird's plumage, typically offers the best warmth-to-weight ratio. Filled with feathers from geese or ducks, down sleeping bags are generally the lightest and most compressible option. They retain their loft longer than synthetic insulation, with fill power ratings ranging from 600 to 900. The higher the fill power, the warmer the bag, and the lighter it is per unit of warmth. However, down insulation loses its insulating properties when wet and can take a long time to dry, so it's best suited for dry climates.
Synthetic insulation, on the other hand, is a more affordable option that performs well in damp climates. Synthetic bags, usually made of polyester, continue to insulate when wet and dry quickly. They are a popular choice for budget-conscious campers and are ideal for camping on snow. However, synthetic bags tend to be heavier and bulkier, making them less convenient for multi-day backpacking trips. Additionally, synthetic insulation gradually loses its warmth over time with repeated compression.
To strike the perfect balance between weight and warmth, consider the mummy-shaped sleeping bag. This style has a snug fit, boosting warmth while reducing weight. With a mummy bag, you roll over with the bag instead of inside it, maximising thermal efficiency. Mummy bags are a popular choice for backpacking due to their lightweight and compressible design.
When selecting a sleeping bag for backpacking, aim for the lightest, most packable option within your budget that will ensure a comfortable night's sleep. Look for bags with low denier shell fabrics and high fill power down to achieve the greatest weight savings and compressibility. A sleeping bag weight of 2 lbs or less is a good target, and remember that the lighter the bag, the higher the price tag.
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Accessories: Look for stash pockets, sleeping pad compatibility, and storage sacks
When it comes to accessories, there are a few key features to consider when purchasing a sleeping bag.
Firstly, stash pockets can be incredibly useful for organising small items. These pockets are perfect for keeping snacks, supplements, medicine, and other essentials easily accessible. If you're an avid camper or hiker, stash pockets can be a lifesaver, allowing you to keep your belongings secure and within reach.
Sleeping pad compatibility is another crucial accessory to factor in. The right sleeping pad can significantly enhance your comfort and warmth during sleep. Look for pads with high R-values, indicating better insulation and heat retention. Some sleeping bags have integrated sleeves designed to hold the pad securely in place, ensuring you don't slide off during the night. Self-inflating or air pads are excellent options, offering durability, insulation, and the ability to customise thickness. If you're a restless sleeper, consider a pad with a textured surface for added stability.
Lastly, a storage sack is essential for properly storing your sleeping bag. Look for a large, breathable cotton or mesh sack to keep your bag dry and well-ventilated. The jumbo cotton storage bag that often comes with sleeping bags is ideal. Alternatively, you can use a king-size pillowcase or purchase a 90L cotton or mesh sack. Remember to extract the bag from its stuff sack, dry it thoroughly, and store it in a cool, dry place, avoiding temperature extremes.
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Frequently asked questions
The three main criteria to consider when choosing a sleeping bag are temperature rating, fill type, and shape.
Sleeping bags come in three basic shapes: rectangular, semirectangular (or "modified mummy"), and mummy. Rectangular bags offer plenty of room for legs and arms to stretch out, while mummy bags are more snug and better retain heat. Semirectangular bags offer a compromise between warmth and roominess.
Sleeping bags can be filled with either down or synthetic materials. Down sleeping bags have a higher warmth-to-weight ratio and are generally lighter and more compressible, but they lose their insulating properties when wet. Synthetic bags are more affordable, can keep you warmer in wet conditions, and dry quickly, but they are usually heavier and bulkier.
