Herbie Murray
Choosing the right compression sack for your sleeping bag is important to ensure you can utilise the entire capacity of your backpack. The size of the compression sack depends on the packed volume of the sleeping bag, which varies depending on the type of sleeping bag. For instance, synthetic sleeping bags do not compress as well as down sleeping bags, and therefore require a larger compression sack. To calculate the size of the compression sack, you can measure the volume of your sleeping bag and add 5 litres.
| Characteristics | Values |
|---|---|
| Type of sleeping bag | Down or synthetic |
| Fill | Down or synthetic |
| Shell and liner fabrics | |
| Bag temperature rating | |
| Bag volume | |
| Bag weight | |
| Bag size | |
| Intended use | Backpacking, car camping, etc. |
| Climate | Cold or mild |
| Mounting | External or internal |
| Dry storage | Dry bag |
| Compression | Compression sack |
| Space constraints | |
| Ease of use | |
| Water resistance |
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What You'll Learn
Sleeping bag materials and compression
The size of the compression sack for a sleeping bag depends on the size and shape of the sleeping bag, as well as its fill. Sleeping bags with down fills are more compressible than synthetic-filled bags and require lower-volume compression sacks. Synthetic sleeping bags, on the other hand, require higher-volume compression sacks as they do not compress as much as down sleeping bags.
When choosing a compression sack, it is important to consider the material and its compatibility with the sleeping bag. The sack's material and design should complement the sleeping bag's fabric and insulation type to enhance protection and durability. Waterproof compression sacks, for example, are ideal for keeping the sleeping bag dry in wet conditions. These sacks are typically made from materials like nylon with a polyurethane coating and have sealed seams and a roll-top closure to prevent water ingress. It is also essential to consider the closure system, such as a roll-top with buckles, to ensure moisture protection.
Additionally, the compression sack should be durable enough to withstand outdoor use. It is recommended to regularly inspect the compression sack for wear and tear to ensure optimal protection for the sleeping bag. The right compression sack can make hauling gear much easier and save space, especially when backpacking, bikepacking, or engaging in other outdoor activities.
It is worth noting that some people prefer to use dry bags or stuff sacks instead of compression sacks for their sleeping bags. They argue that compression sacks limit the ability to utilise the entire capacity of the pack and turn the sleeping bag into a solid item that requires a specific volume. Others prefer the organisation and water protection that compression sacks offer. Ultimately, the decision between a compression sack and other alternatives depends on personal preference and the specific requirements of the outdoor activity.
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Compression sack sizing
Compression sacks are a handy way to save space when packing. They are particularly useful for compressing bulky items such as sleeping bags and down jackets, reducing them to almost a third of their size. The size of the compression sack you need depends on several factors. Firstly, sleeping bags vary in their packed volume depending on their fill and fabric. Down bags are more compressible than synthetic-filled bags and hence require lesser volume compression sacks. Synthetic bags, on the other hand, need higher-volume compression sacks as they do not compress as much.
If you are backpacking, you will want to compress your sleeping bag as much as possible to save space in your backpack. In this case, the rule of thumb is to take the compressed volume of your sleeping bag and add 5 litres to determine the size of the compression sack. For example, if your sleeping bag has a compressed volume of 5.3 litres, you will need a compression sack of at least 10.3 litres.
However, it is important to note that compression sacks limit your ability to utilise the entire capacity of your backpack. This is because a compressed sleeping bag becomes a solid item that requires a specific volume to fit in the pack. Instead, some people prefer to stuff their sleeping bags around more rigid items in their backpack.
Additionally, if you intend to pack items that are at the upper limit of the volume shown in the size column, it is recommended to choose a size larger, especially for use in cold weather. This is because compression sacks are usually designed for lightweight and water-resistant gear, and larger sizes can provide extra protection in cold weather conditions.
Finally, if you are car camping, a compression sack is not necessary. A regular stuff sack will suffice for transporting your sleeping bag from home to your campsite. At home, it is recommended to store your sleeping bag in a large canvas, cotton, or nylon net bag to allow the bag to breathe, which is especially important for goose down sleeping bags.
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Dry bags vs compression sacks
The choice between dry bags and compression sacks depends on several factors, including the type of sleeping bag, the available space in your backpack, and the conditions of your hike.
Compression sacks are space-saving storage bags that can reduce bulky items like sleeping bags to almost a third of their size, making more room in your backpack. The size of the compression sack depends on the packed volume of your sleeping bag, which varies according to its filling and fabric. Down-filled sleeping bags, for instance, are more compressible and require smaller volume sacks than synthetic-filled bags. Compression sacks are ideal if you want to maximise space in your backpack and utilise the entire capacity of your pack. However, they may not be necessary if you have a weather-resistant pack or liner to keep your items dry.
Dry bags, on the other hand, are ideal if you want to ensure that your items stay dry during your hike, especially if you anticipate your gear being submerged in water. They offer limited compression compared to compression sacks, as they hold more air. However, dry bags like the Sea to Summit Ultra-Sil Dry Bag can be compressed by squeezing the air out, and they are still able to keep items dry without the need for a dedicated compression sack.
Ultimately, the decision between dry bags and compression sacks is a matter of personal preference. If you prioritise space-saving and efficient packing, a compression sack might be the better option. But if keeping your gear dry is your primary concern, a dry bag could be the right choice, even if it takes up slightly more space.
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Compression sack weight
The weight of a compression sack is an important factor to consider when choosing one for your sleeping bag. While compression sacks are designed to save space, some options may add unnecessary weight to your pack.
The weight of a compression sack can vary depending on its size, material, and features. For example, larger compression sacks will naturally weigh more than smaller ones. Additionally, compression sacks made from heavier materials, such as nylon or polyester, may be more durable but will also add more weight. On the other hand, lightweight options, such as those made from Dyneema, are often more expensive and may not be as long-lasting.
Some compression sacks also come with additional features that can impact their weight. For instance, compression sacks with multiple compression straps can help to reduce bulk and create a more even compression. However, these extra straps can also add a bit of weight to the overall sack. Similarly, compression sacks with waterproof or water-resistant coatings, such as a durable water repellent (DWR) finish, can protect your gear from the elements but may also contribute slightly to the overall weight.
It's important to consider the trade-off between weight and durability when choosing a compression sack. While ultralight options can help keep your pack weight down, they may not offer the same level of protection or longevity as heavier-duty sacks. Ultimately, the best compression sack for your sleeping bag will depend on your specific needs and priorities, balancing weight considerations with other factors like size, compressibility, and durability.
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Compression sack volume
The volume of a compression sack depends on the size and shape of the sleeping bag, as well as its fill. Sleeping bags filled with down are more compressible than synthetic-filled ones and require lower-volume compression sacks. Synthetic insulation-filled sleeping bags, on the other hand, require higher-volume compression sacks.
To determine the appropriate compression sack volume for a sleeping bag, it is recommended to take the compressed volume of the sleeping bag and add 5 litres. This allows for sufficient room in the bag's main compartment and facilitates easy closure of the end cap. For example, if a sleeping bag has a compressed volume of 5.3 litres, a compression sack size of at least 10.3 litres is recommended.
It is worth noting that compression sacks limit the ability to utilise the entire capacity of a backpack. Sleeping bags without compression sacks can be stuffed into the gaps between solid items in the pack. However, compression sacks can be useful when space is limited, as they can compress bulky items like sleeping bags to a fraction of their original size.
When choosing a compression sack, it is generally advised to select the smallest size possible that fits the sleeping bag. Down sleeping bags can compress to a greater extent than synthetic bags, so it is important to consider the type of fill when determining the appropriate volume. Additionally, for cold-weather expeditions, it is often recommended to choose a size larger to accommodate bulkier items.
To measure the volume of a sleeping bag, one can place the bag in a cardboard box and press it down firmly until the upper surface is roughly level. Then, by multiplying the length, width, and depth of the compressed bag, the volume in cubic inches can be calculated. This measurement can guide the selection of an appropriately sized compression sack.
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Frequently asked questions
The size of the compression sack depends on the compressed volume of your sleeping bag. A rule of thumb is to take the compressed volume of your sleeping bag and add 5 litres. For example, if your sleeping bag has a compressed volume of 5.3 litres, you will need a compression sack of at least 10.3 litres.
Yes, sleeping bags with different fillings will require different compression sack sizes. Sleeping bags filled with down are more compressible than synthetic-filled ones and hence need lesser volume compression sacks.
Compression sacks are handy when space is limited. They can compress bulky items like sleeping bags to almost a third of their size, creating more room in your backpack.
Place your sleeping bag in a cardboard box and press it down firmly until the upper surface is roughly level. Measure the average depth in inches and multiply it by the length and width to get the volume in cubic inches.
