Colin Snow
Sleeping bags can be compressed to a very small size, but this should only be done for short periods to avoid damaging the bag. The smaller the bag is compressed, the more the longevity is affected. Sleeping bags filled with down are more compressible than synthetic-filled bags and need less volume in stuff sacks. However, it is important to note that the compression affects the bag's ability to insulate, as the insulation needs to fluff up (loft) to trap body heat and keep the sleeper warm. Therefore, it is recommended to store sleeping bags in a roomy corner of a closet, using the jumbo cotton storage bag they usually come with, which allows for air circulation without compressing the fill.
| Characteristics | Values |
|---|---|
| Ideal storage method | A roomy corner in a closet in a jumbo cotton storage bag |
| Compression sack size | Dependent on the sleeping bag's size, shape, and fill. Down sleeping bags are more compressible and require a lesser volume sack. |
| Compression duration | No longer than 12 hours |
| Compression effects | Loss of loft and resiliency |
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What You'll Learn
The impact of compression duration on bag longevity
Sleeping bags filled with down are more compressible than synthetic-filled bags and require less volume in a stuff sack. However, regardless of the filling, the longer a sleeping bag remains compressed, the greater the potential damage. This is because the insulation in a compressed bag cannot fluff up (loft) properly, reducing its ability to trap body heat and keep you warm.
Some sources suggest that down sleeping bags can be compressed for brief periods without long-term negative effects. In practice, however, it is challenging to maintain completely clean and oil-free down, which is critical for the bag's resilience during compression. Body oils, sweat, and dirt can compromise the performance of the bag over time.
To minimise the impact of compression duration on bag longevity, it is recommended to only pack the sleeping bag as tightly and for as long as necessary. When not in use, it is best to store the bag in a roomy corner of a closet, using the jumbo cotton storage bag that often comes with the purchase. This allows for adequate air circulation and prevents the compression of the fill.
Additionally, it is important to dry and wash your sleeping bag periodically to prevent damage from moisture and contamination. By following these practices, you can effectively manage the impact of compression duration on your sleeping bag's longevity and maintain its performance for many adventures to come.
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Oil-free down bags can be stored compressed indefinitely
While it is possible to compress sleeping bags to a very small size, doing so damages the bag. Technically, every second a sleeping bag is compressed is a checkmark against its longevity, and the tighter it is compressed, the more true this is. However, down sleeping bags are quite resilient to compression and decompression, which is why they are popular for ultralight backpacking.
Body oils, sweat, and dirt in the insulation can compromise performance, so it is recommended to wash sleeping bags periodically. If you are an avid backpacker, it is recommended to wash your bag once a season. When drying your bag, always use a low heat setting and check it frequently to avoid damage from heat or twisting.
It is also important to note that moisture and temperature extremes are hard on sleeping bags, so it is best to avoid storing them in damp basements, unheated spaces, or car trunks. Instead, find a roomy corner in a closet to store your bag in a jumbo cotton storage bag that most bags are sold with today. These bags keep things contained without compressing the fill, while also allowing air circulation.
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Insulation loft is key to warmth
The size to which a sleeping bag can be compressed depends on several factors, including the type of insulation and the quality of the bag. Down-filled sleeping bags are generally considered superior to synthetic fills for hiking and camping because they offer better warmth-to-weight ratios. They are also more compressible and require smaller compression sacks. However, synthetic fills are more suitable for wet conditions.
Regardless of the insulation type, the loft of a sleeping bag is critical to its ability to provide warmth. The loft refers to the bag's puffiness, which creates small air pockets within the insulation. These pockets trap body heat and keep you warm. A puffier bag usually indicates a warmer bag, as it has more loft.
The construction of the bag also affects its warmth. For instance, the placement of baffles or chambers helps control the distribution of down, preventing cold spots. Higher-quality down has better 'cling', meaning it sticks together in a single mass within each chamber, providing better insulation. The construction should also seal out drafts and retain insulation around the sleeper, especially in areas like the hood and foot box.
To maintain the insulation loft and, consequently, the warmth of your sleeping bag, it is essential to care for and store it properly. Body oils, sweat, and dirt can compromise the performance of the bag, so it is recommended to wash it periodically. When storing, avoid compressing the bag for extended periods, as this can affect its lofting ability. Instead, use a jumbo cotton storage bag to allow for air circulation without compressing the fill.
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Synthetic bags are less compressible than down bags
The compressibility of a sleeping bag is a key factor in its performance, and it is largely determined by the type of insulation used. Sleeping bags can be insulated with either down or synthetic materials, and down sleeping bags are more compressible than synthetic bags.
Down is the plumage found underneath the exterior feathers on waterfowl such as ducks and geese, and it consists of soft, fluffy, wispy filaments. Down insulates by trapping air and is prized for being lightweight, easy to compress, long-lasting, and breathable. The higher the fill power rating, the better the insulation, loft, and compressibility of the down. A sleeping bag with a fill power rating of 700 will be lighter than a bag with a rating of 600, assuming the other features are comparable. Down sleeping bags can be easily compressed into a stuff sack, making them a favourite among backpackers.
Synthetic sleeping bags, on the other hand, are less compressible due to the construction of their fibres. Synthetic fibres tend to be stiffer and require more material to fill the same space as down, making synthetic bags heavier and bulkier. Synthetic bags can be challenging to fit back into a stuff sack, and they may deteriorate faster over time if left compressed for long periods.
The choice between a down or synthetic sleeping bag depends on various factors, including temperature, price, compressibility, and weight. Synthetic bags are generally much less expensive than down bags, and they retain some warmth when wet, making them a popular choice for those who prioritize cost and moisture resistance. Down bags, on the other hand, offer superior warmth-to-weight ratios and compressibility, making them ideal for ultra-light purists and bike packers.
While down bags are highly compressible, it is important to note that they should not be compressed beyond what is necessary. Every second a down bag is compressed impacts its longevity, and oil contamination can cause a loss of loft. Properly stored down bags can be extremely resilient, and a clean down bag stored in an extremely small bag for over two years has been observed to puff up to its original size after being released.
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Body oils, sweat and dirt can compromise bag performance
Sleeping bags can be compressed to a fairly small size, but it is important to remember that the tighter the bag is compressed, the more likely it is to sustain damage. While it is possible to compress a sleeping bag for a short period of time without causing damage, it is generally not recommended to store a sleeping bag in a compressed state for extended periods.
Now, regarding the impact of body oils, sweat, and dirt on sleeping bag performance:
Body oils, sweat, and dirt can compromise the performance of a sleeping bag by affecting its insulating power. Over time, these contaminants can build up on the bag's fabric and insulation, reducing its ability to trap body heat and keep the user warm. This is because oils, sweat, and dirt can interfere with the lofting ability of the insulation, which is key to maintaining warmth. Loft refers to the ability of the insulation to fluff up and create small air spaces that trap body heat. When the insulation is contaminated or compressed, it cannot loft properly, leading to reduced warmth.
Additionally, body oils and sweat can attract bacteria, mould, and mildew, which can further degrade the performance of the sleeping bag. If the bag is not properly cleaned and dried, these contaminants can cause unpleasant odours, leave stains, and even compromise the structural integrity of the fabric and insulation. Therefore, it is important to prioritise keeping the sleeping bag clean and dry, and to wash and dry it periodically using the appropriate methods.
To mitigate the effects of body oils, sweat, and dirt, it is recommended to sleep in clean clothing, including long underwear, socks, and a clean shirt if possible. A knit cap or bandana can protect the bag from oily hair, and sunscreen should be wiped off before entering the bag. Using a sleeping bag liner can also act as a barrier between your body and the bag, keeping it cleaner for longer and extending its lifespan.
When washing a sleeping bag, it is important to follow the manufacturer's instructions and use specialised cleaning products suitable for the type of insulation. Gentle soaps or performance wash products designed for down or synthetic fills are recommended. Avoid dry cleaning, fabric softeners, bleach, and agitators in washing machines, as these can damage the bag. Instead, opt for hand washing or a front-loading machine without an agitator. Always ensure the bag is thoroughly dried before storage, as even slight dampness can lead to mould or mildew formation.
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Frequently asked questions
It depends on the type of sleeping bag. Down sleeping bags are more compressible than synthetic ones and can be compressed to a microscopic size for brief periods of time without damage. However, it is recommended to only compress the bag as much as necessary for your trip to preserve its longevity.
It is recommended to store sleeping bags in a roomy corner of a closet in a jumbo cotton storage bag. This keeps the bag contained without compressing the fill, allowing for air circulation.
The size of the stuff sack depends on the size and shape of the sleeping bag, as well as the fill. Sleeping bags filled with down require a smaller volume stuff sack than synthetic bags. As a comparison, the stuff size of the Marmot Pinnacle sleeping bag is 7.5X13, while the Sierra Designs bag stuffs down to 7X17.
Yes, you can compress your sleeping bag in its stuff sack for travel. To do so, lay on top of the bag or roll it up to gently squeeze the air out, then quickly stuff it into the sack starting at the foot and working towards the head. Avoid compressing the bag smaller than the original sack, as this can damage the insulation.
It is recommended to avoid keeping your sleeping bag compressed in its stuff sack for extended periods of time, as this can cause it to lose its resiliency and lofting ability. Sleeping bags should be stored in a large storage bag to allow them to puff back up and maintain their insulation.
