Herbie Murray
Sleeping bags come in different sizes and types, and their volume depends on factors such as their shape, size, and fill. Down-filled sleeping bags, for example, are more compressible than synthetic-filled ones and require smaller stuff sacks. The volume of a sleeping bag can be calculated by measuring the bottom diameter of the bag, finding the circle area, and multiplying it by the height. A child's sleeping bag, for instance, is approximately 6 litres, while an adult's sleeping bag can range from 12.5 to 20 litres. The compressed volume of a sleeping bag can be used to determine the size of the compression sack required, with a rule of thumb being to add 5 litres to the compressed volume to determine the required sack size.
| Characteristics | Values |
|---|---|
| Child's sleeping bag volume | 6L |
| Adult sleeping bag volume | 12.5L |
| Synthetic insulation-filled sleeping bag | Requires a higher volume stuff sack |
| Down sleeping bag | Requires a lower volume stuff sack |
| Sleeping bag in a compression sack | Add 5L to the compressed volume of the bag |
| Sleeping bag in a backpack | Place at the bottom and fill out, then compress by adding items on top |
| Sleeping bag storage | Store uncompressed in a box, pillowcase, or bag |
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What You'll Learn
Sleeping bag volume calculation
The volume of a sleeping bag depends on various factors, including the size and shape of the bag, the type of filling, and the compression method used. Sleeping bags filled with down are more compressible than synthetic-filled ones and hence require smaller stuff sacks. Manufacturers often recommend a stuff sack size, which is usually larger than the compressed volume of the sleeping bag. It is important to ensure that the bag is not overly compressed, as this can affect its performance and durability.
To calculate the volume of a sleeping bag, one can use the cylinder shape volume calculation formula, which involves measuring the bottom diameter of the bag to find the circle area and then multiplying it by the height. This will give an approximate volume in cubic centimetres, which can then be converted to litres by dividing the value by 1000. For example, if the cylinder has a diameter of 20 cm and a height of 50 cm, the volume would be approximately 20 x 20 x 50 = 20,000 cubic centimetres, or 20 litres.
Another method to estimate the volume is to compare it to the volume of a standard backpack. A typical sleeping bag might take up a similar volume to a 20-litre backpack, whereas a child's sleeping bag might be closer to 6 litres.
When choosing a stuff sack, it is recommended to aim for between 1.5 and twice the volume of the sleeping bag for down models, and slightly more for synthetic models. It is also important to consider the ease of packing and unpacking, especially if the bag needs to be compressed and extracted daily. A larger stuff sack can provide extra space for other items, such as spare socks, a fleece, or a rain jacket.
Additionally, it is worth noting that compression sacks are often sized in whole litres, so a 5.3-litre compressed bag might require a rounded-up size of 11 or 12 litres for a comfortable fit.
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Compression sacks
The volume of a sleeping bag can vary depending on its size and whether it is compressed or not. A child's sleeping bag is estimated to be around 6 litres, while a normal-sized sleeping bag can be approximately 12.5 litres when compressed.
To estimate the required size of your compression sack, a rule of thumb is to take the compressed volume of your sleeping bag and add 5 litres. This will provide enough room in the sack's main compartment, making it easier to close. For example, if your sleeping bag has a compressed volume of 5.3 litres, a compression sack of at least 10.3 litres is recommended. However, it is important to note that compression sacks are typically available in whole litre sizes, so rounding up to the nearest litre or two may be necessary.
Additionally, consider the features and materials of the compression sack. Water-resistant or waterproof sacks can help keep your gear dry during wet conditions. Some sacks may also offer a unique design that evenly distributes the stress of compression, preventing bulging and allowing for more efficient space utilisation. Proper care and maintenance of your compression sack are important, with hand washing and air drying recommended by some manufacturers.
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Recommended stuff sack size
The recommended stuff sack size for a sleeping bag varies depending on the size and shape of the sleeping bag, as well as its filling. Down-filled sleeping bags are more compressible than synthetic-filled ones and hence require smaller stuff sacks. For down-filled sleeping bags, a stuff sack with a volume between 1.5 and twice the volume of the sleeping bag in its compressed state is recommended. For synthetic-filled sleeping bags, a higher-volume stuff sack is needed, and a compression stuff sack may be required to reduce the amount of space taken up in a backpack.
Some sleeping bags come with manufacturer-supplied compression bags. These are typically on the smaller end of the spectrum, allowing for high compression. The recommended stuff sack size is usually given in either dimensions (e.g., 6 x 11 inches) or volume (e.g., 5 litres). It is worth noting that the listed volume of a stuff sack is often uncompressed, representing its maximum volume. Therefore, it is important to consider the compressed volume of the sleeping bag when choosing a stuff sack. A rule of thumb is to take the compressed volume of the sleeping bag and add 5 litres to determine the required stuff sack size.
When choosing a stuff sack, it is essential to ensure that the sleeping bag can be comfortably stuffed without being overly compressed. A stuff sack that is too large will result in bottoming out the straps before achieving adequate compression. Conversely, a stuff sack that is too small may make it difficult to fit the sleeping bag, and high compression can lead to concerns about ripping, especially with ultralight stuff sack models. It is recommended to test the stuffing process when purchasing a stuff sack to ensure it corresponds to the volume of the sleeping bag.
Some individuals prefer to use a larger stuff sack that can accommodate the sleeping bag and additional items such as spare socks, a fleece, or a rain jacket. This approach allows for efficient use of space, especially when using an external frame pack where the stuff sack is readily accessible. However, it is generally not recommended to store a sleeping bag in its stuff sack for extended periods, as it is preferable to allow the bag to retain its full loft when not in use. Instead, a box, pillowcase, or old hockey bag can be used for storage between trips.
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Synthetic vs down sleeping bags
The volume of a sleeping bag depends on its size and shape, as well as its fill. Sleeping bags filled with down are more compressible and require smaller stuff sacks than synthetic bags. A child's sleeping bag is estimated to be around 6 litres, while a normal-sized bag can range from 11 to 12.5 litres when adequately compressed.
Now, when it comes to choosing between a synthetic and a down sleeping bag, there are several factors to consider. Down sleeping bags are generally lighter, more durable, and easier to compress, making them ideal for backpacking and camping. They have superior warmth-to-weight ratios and provide better insulation due to their structure of fine, branched filaments. However, down sleeping bags are typically more expensive, with prices varying based on the global supply of down. Additionally, down loses its insulating properties when wet and is susceptible to rot if not properly dried.
On the other hand, synthetic sleeping bags offer excellent water resistance. They are designed to maintain their insulating qualities even when wet and dry faster than down bags. Synthetic bags are usually more affordable, making them a budget-friendly option for campers. However, they don't compress as well as down bags, resulting in a higher weight-to-volume ratio. Synthetic bags may also retain smells more than down alternatives.
The decision between a synthetic and a down sleeping bag depends on your specific needs and budget. If you prioritise lightweight and compact gear, or engage in activities like backpacking and alpinism, a down bag is an excellent choice. However, if you frequently camp in wet conditions and require reliable insulation when damp, a synthetic bag might be preferable.
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Storage methods
The volume of a sleeping bag can vary depending on its size and how it is stored. A child's sleeping bag is estimated to be around 6 litres, while a normal-sized sleeping bag can range from 12.5 litres to 423 litres, depending on its compression.
Storage Sacks
Stuff sacks or compression sacks are commonly used to store sleeping bags. The volume of the sack will depend on the sleeping bag's size and fill. Down sleeping bags, for instance, are more compressible and require smaller sacks. Synthetic insulation-filled bags, on the other hand, may need larger sacks and additional compression to reduce the space they take up in your backpack. It is recommended to avoid over-compressing your sleeping bag for extended periods, as this can cause it to lose its loft or fluffiness.
Breathable Containers
To maintain the condition of your sleeping bag, it is important to store it in a cool, dry, and well-ventilated area. Breathable cotton or mesh sacks are ideal for this purpose, as they allow air circulation while keeping the bag contained. If you don't have a storage sack, a king-size pillowcase or a large laundry bag can be used instead.
Hanging
If space is limited, hanging your sleeping bag in a closet or from a curtain rod is an option. This method ensures the bag remains off the ground and out of direct sunlight, which can damage the exterior coating and materials.
Unrolled Storage
Storing your sleeping bag unrolled and uncompressed is ideal. If possible, keep it fully unrolled under your bed or in a roomy corner of your closet. This method helps maintain the bag's original shape and form, ensuring it doesn't become creased or damaged.
Cleaning and Drying
Before storing your sleeping bag, it is important to clean and dry it thoroughly. Natural body oils, dirt, and grime can build up over time, reducing the effectiveness of the insulation. Spot-clean your bag after each use, and consider washing it periodically to maintain its performance. When drying, avoid high temperatures and direct sunlight, as these can damage the bag. Instead, dry it in a well-ventilated area, using a fan or dehumidifier to speed up the process if needed.
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Frequently asked questions
The volume of a sleeping bag depends on its size, shape, and fill. A child's sleeping bag is approximately 6 liters, while an adult's sleeping bag can range from 5 to 20 liters when compressed. Sleeping bags filled with down are more compressible and take up less space than synthetic-filled bags.
Sleeping bags are typically packed in stuff sacks or compression sacks, with the recommended size given by the manufacturer. It is important to ensure the bag is not overly compressed, as this can reduce its insulating properties. One method is to place the sleeping bag at the bottom of your backpack and fill the remaining space with other items, compressing the bag without the need for a separate stuff sack.
The size of the stuff sack depends on the volume of your sleeping bag when compressed. The rule of thumb is to take the compressed volume and add 5 liters to determine the minimum size of the stuff sack needed. For example, if your sleeping bag compresses to 5 liters, a 10-liter stuff sack would be sufficient.
