
Choosing a sleeping bag for hiking can be a complicated decision, with a lot to consider. The bag's weight, packability, warmth, comfort, and cost are all important factors. Sleeping bags come in three basic shapes: rectangular, semirectangular, and mummy. Rectangular bags offer ample room to stretch out, while mummy bags are more snug and better for retaining warmth. The type of insulation is another key consideration: down feathers or synthetic fibres. Down bags perform better in dry locations as they weigh less and pack smaller, but they are more expensive. Synthetic bags are more suitable for wet climates and are a good option for inexperienced hikers. When selecting a sleeping bag, it's also important to consider the temperature rating, which indicates the lowest temperature the bag is designed for. It's recommended to choose a bag with a rating slightly lower than the typical low temperatures you expect to encounter.
| Characteristics | Values |
|---|---|
| Temperature Rating | Choose a bag with a temperature rating that is lower than the lowest temperature you expect to encounter. |
| Shape | Rectangular, semi-rectangular, mummy, double, kids' sleeping bags. |
| Insulation | Down feathers or synthetic fibres. Down has a better warmth-to-weight ratio and is more expensive. Synthetic is better for wet climates. |
| Weight | Lighter bags are preferable for hiking as they are easier to carry. |
| Compressibility | Bags that pack down smaller are better for hiking as they take up less space. |
| Ethical Standards | Look for bags labelled RDS or TDS to indicate ethical treatment of ducks and geese. |
| Shell Material | Polyester or nylon with a durable water repellent finish. |
| Zipper | Multiple zipper sliders make it easier to adjust ventilation. |
| Comfort | Choose a bag that is comfortable for your sleeping style and the conditions you'll be sleeping in. |
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What You'll Learn
- Sleeping bag shape: rectangular, semirectangular, mummy, or double
- Temperature ratings: choose a bag with a lower rating than the lowest temperature you expect
- Weight and compressibility: the lighter and more packable, the better
- Type of insulation: down feathers or synthetic fibres
- Ethical down: look for RDS or TDS labels

Sleeping bag shape: rectangular, semirectangular, mummy, or double
The shape of a sleeping bag is an important consideration when choosing a hiking sleeping bag. Sleeping bags come in three basic shapes: rectangular, semirectangular or modified mummy, mummy, and double. Each shape has its own advantages and disadvantages, and the right choice depends on your individual needs and preferences.
Rectangular sleeping bags offer plenty of room for both legs and arms to stretch out, making them ideal for people who move around a lot in their sleep or prefer sleeping in different positions. They can also be completely unzipped and used like a comforter. However, rectangular bags can be bulky and may not retain heat as efficiently as other shapes, especially in cold weather conditions.
Semirectangular or modified mummy sleeping bags offer a compromise between warmth and roominess. They come in a variety of shapes, including the barrel shape and the spoon shape, which cater to people who want more wiggle room than a traditional mummy bag.
Mummy sleeping bags have a tapered form, wider at the shoulders and narrower at the feet, resembling a mummy’s shape. This tapered shape helps retain heat more efficiently by minimising the amount of empty space that needs to be warmed. Mummy bags are also more lightweight and packable, making them a good choice for hikers who need to save space. However, some people may find the snug fit restrictive and uncomfortable, especially if they are side sleepers or prefer to sleep in various positions.
Double sleeping bags are designed for two people and are ideal for couples. They are usually the size of a full blanket and can be zipped together with compatible bags. Standard double sleeping bags are larger and heavier than other options, so they may not be the best choice for backcountry hiking unless you opt for zipper-compatible bags.
When choosing a sleeping bag shape, it's important to consider your sleeping style, the amount of space you have, and the temperature rating of the bag. For hiking, weight and compressibility are also crucial factors, as you want to minimise bulk and weight when hauling your gear.
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Temperature ratings: choose a bag with a lower rating than the lowest temperature you expect
When choosing a hiking sleeping bag, one of the most important factors to consider is its temperature rating. Sleeping bag temperature ratings can be a complicated subject, as they are based on standardised tests that simulate how a sleeping bag should be used. The tests take into account factors such as the clothing and gear of the user, the sleeping pad, and the sleeping bag itself. However, it's important to remember that these ratings are estimates and may not account for all variables that can affect how warm or cold you feel when using the bag outdoors.
To ensure you stay warm on your hiking trips, it's generally recommended to choose a sleeping bag with a temperature rating that is lower than the lowest temperature you expect to encounter. This is because you can always unzip the bag or open it up to cool down if conditions are warmer than expected. On the other hand, if you pick a bag with a higher temperature rating than the lowest expected temperature, you risk being too cold and uncomfortable.
When considering the temperature rating of a sleeping bag, it's important to know your own personal internal thermostat. If you tend to feel cold easily, look for a bag with a comfort rating that is significantly lower than the coldest expected temperature. A comfort rating indicates the temperature at which a cold sleeper is expected to feel comfortable. On the other hand, if you tend to sleep warm, you may be able to choose a bag with a lower limit rating, which indicates the temperature at which a warm sleeper might still feel comfortable. However, it's always a good idea to give yourself a buffer of a few degrees Celsius, especially if you're camping in mountainous areas where temperatures can drop significantly at night.
It's also worth noting that sleeping bag temperature ratings are based on an average sleeper and may not account for individual differences in body types, metabolism, and other factors. Additionally, the type of insulation, weight, and compressibility of the sleeping bag can also affect its warmth and should be considered when making a purchase decision. Ultimately, the goal is to balance weight and compressibility with the correct level of warmth for your hiking needs.
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Weight and compressibility: the lighter and more packable, the better
When it comes to choosing a sleeping bag for hiking, weight and compressibility are key considerations. You'll be carrying your sleeping bag in your pack, so the lighter and more packable it is, the better.
Sleeping bags can be made with either down feathers or synthetic fibres. Down bags tend to be lighter and more compressible than synthetic bags of equivalent warmth. They also last longer, as they maintain their loft better after repeated packing and unpacking. However, down is more expensive and loses its insulating properties when wet. Synthetic bags are generally more affordable, and they perform better in wet conditions.
The weight of a sleeping bag is also influenced by the quality of its insulation and the cut of the bag. Mummy-shaped bags, for example, cut down on weight by providing a snug fit—you roll over with the bag rather than inside it. They also retain warmth better than rectangular or semi-rectangular bags, which offer more room to move around.
Temperature ratings are another important factor to consider when choosing a hiking sleeping bag. A bag's temperature rating indicates the lowest temperature at which it will keep a sleeper warm. It's wise to choose a bag with a rating slightly lower than the lowest temperature you expect to encounter, as you can always unzip the bag if you get too warm. However, a warmer bag is better than a cold one, so if you're unsure, err on the side of warmth.
In addition to weight and compressibility, you'll also want to consider the features that will make your bag work best for you. This could include adjustment features, stash pockets, and pad compatibility.
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Type of insulation: down feathers or synthetic fibres
When choosing a hiking sleeping bag, one of the most important considerations is the type of insulation: down or synthetic fibres. Both have their advantages and disadvantages, so it's important to understand the differences between them before making a decision.
Down insulation is made from the soft, fluffy plumage found underneath the exterior feathers of waterfowl, such as ducks and geese. It is known for its superior warmth-to-weight ratio, breathability, and compressibility. Down-filled sleeping bags are usually lighter and easier to pack down compared to synthetic bags. They are also long-lasting, making them a good investment despite their higher price point. However, one of the main drawbacks of down is its performance in wet conditions. Down tends to clump and lose its insulating properties when it gets wet, which can be an issue if you anticipate encountering heavy rain or moisture during your hikes.
Synthetic insulation, on the other hand, is made from polyester fibres. It is a popular choice due to its high level of insulation, durability, and fast-drying capabilities. Synthetic sleeping bags are generally more affordable than down bags, and they require less care in cleaning and storage. They perform better when wet, as they are able to retain some insulation even when soaked. Synthetic insulation comes in two main types: short-staple and continuous filament. Short-staple insulation feels softer and more flexible, similar to down, but it is less durable and may create cold spots as the insulation can shift around. Continuous filament insulation, on the other hand, is stronger, more durable, and less likely to create cold spots, but it tends to feel stiffer and is less compressible.
When deciding between down and synthetic insulation, consider factors such as weight, packability, cost, and anticipated weather conditions. If you prioritise lightweight and compact gear, down might be the better option. However, if you expect to encounter wet weather frequently, synthetic insulation could be a wiser choice due to its better performance in moisture management. Ultimately, the decision depends on your specific needs and preferences as a hiker.
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Ethical down: look for RDS or TDS labels
When choosing a hiking sleeping bag, it is important to consider ethical sourcing practices. Most brands take steps to monitor the treatment of ducks and geese that provide down. You can identify these manufacturers by looking for sleeping bags labelled with either RDS (Responsible Down Standard) or TDS (global Traceable Down Standard). These standards ensure responsible down-sourcing through strict standards in animal welfare, detailed traceability, and robust auditing, thereby supporting ethical practices in the supply chain.
The RDS label certifies that the down and feathers in products like sleeping bags and outerwear are sourced from ducks and geese that were treated humanely. While down is a byproduct of the food industry, this standard prohibits cruel practices such as live plucking and force-feeding. RDS certification also mandates that ducks and geese are cared for according to the five freedoms of animal welfare.
Similarly, the TDS label signifies compliance with the Global Traceable Down Standard, which includes strict requirements for animal welfare and detailed traceability. This standard ensures that down and feathers come from sources that respect animal welfare and can be traced back to their origin.
By choosing a sleeping bag with an RDS or TDS label, you can be confident that the product meets rigorous animal welfare standards and that the manufacturers are committed to ethical practices in their supply chain.
In addition to ethical down, you may also want to consider other sustainability aspects when choosing a sleeping bag. Certifications like Bluesign, Fair Trade, and Oeko-Tex Standard 100 indicate that the sleeping bag is produced with minimal environmental impact, fair labour practices, and safe materials.
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Frequently asked questions
The key factors to consider are the type of insulation, weight, packability, warmth, comfort, and shape.
Sleeping bags typically have two types of insulation: down feathers or synthetic fibres. Down bags perform better in dry locations as they weigh less and pack smaller than synthetic bags of equivalent warmth. Synthetic bags are more suitable for wet climates as down feathers clump and lose their ability to insulate when wet.
Sleeping bags come in three basic shapes: rectangular, semirectangular, and mummy. Rectangular bags offer plenty of room for legs and arms to stretch out, and some can be unzipped and used as comforters. Semirectangular bags offer a compromise between warmth and roominess. Mummy bags are snug-fitting to boost warmth and cut weight.











































