
Sleeping bags can be washed in warm or cold water, but never in hot water. Sleeping bags are usually made with down or synthetic fillers, and both types of sleeping bags can be washed in a washing machine or by hand. However, it is important to avoid using standard laundry detergent, as this can cause the filaments of down plumes and feathers to stick together, preventing them from lofting. Instead, a specialised cleaner, such as Nikwax Down Wash Direct, should be used.
| Characteristics | Values |
|---|---|
| Water temperature | Warm or cold |
| Wash cycle | Delicate or gentle |
| Spin cycle | Fast or long |
| Rinse cycle | Extra |
| Drying method | Tumble dry, air dry, or hang dry |
| Drying temperature | Low |
| Drying time | Several hours |
| Additional items | Tennis balls, dryer balls, or laundry sack |
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What You'll Learn

Machine wash on a delicate cycle, no higher than 40°C/100°F
When it comes to washing a down sleeping bag, it's important to take precautions to avoid damaging the bag or compromising its insulation. While handwashing is gentler on the fabric and stitching, machine washing is possible if done correctly.
Firstly, only use a front-loading washing machine without an agitator, as top-loading machines can cause the down to shift or clump. Select a delicate wash cycle with a temperature setting of no higher than 40°C/100°F. It is crucial that you do not exceed this temperature limit, as higher temperatures can damage the bag. Zip up all zippers before placing the bag in the machine, and ensure you are using a detergent specifically formulated for down, such as Nikwax Down Wash Direct, or one that is stated as safe for down items. Avoid standard laundry detergents, as these can cause clumping and reduce loft.
During the wash cycle, you may wish to add a couple of damp articles of clothing, such as towels or t-shirts, to help balance the spin of the machine. It is also important to ensure a thorough rinse, so set the machine to perform at least two rinse cycles to completely remove any detergent residue. This residue can prevent the down fibres from lofting, so it is crucial to ensure it is all rinsed away.
After the wash cycle, select an additional spin cycle to extract as much water as possible before drying. This step is important, as the weight of water in the down can tear the internal baffles if the bag is picked up when full of water. Once the spin cycle is complete, carefully remove the sleeping bag from the machine, supporting the entire bag to avoid straining and ripping the seams. Gently squeeze out any remaining excess water, and proceed to the drying step.
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Use specialist products like Nikwax Down Wash Direct
When it comes to washing a down sleeping bag, it is recommended to use specialist products like Nikwax Down Wash Direct. This is because standard laundry detergent can lead to clumping or reduced loft.
Nikwax Down Wash Direct is a specialist cleaner designed to revitalise the water repellency and insulating properties of hydrophobic and regular down-filled gear. It is a gentle, detergent-free cleaner that is specially formulated to launder down feathers without weighing down the loft. The product is PFAS-free, easy to use in a washing machine, and ensures that the whole item is thoroughly cleaned.
To use Nikwax Down Wash Direct, first, unzip your sleeping bag completely to prevent the slider from snagging or breaking. If you are handwashing, fill your bathtub with three gallons (12-15L) of hand-hot water and add 3.3 fl oz (100ml) of the product. Immerse the sleeping bag and agitate to mix, ensuring complete wetting. Leave to soak for 5-10 minutes, then agitate thoroughly. Rinse thoroughly until the water runs clear.
If you are using a washing machine, place a maximum of two items in the machine and add 3.3 fl oz (100ml) of the product. Wash according to the item's care label, preferably on a low setting and slow spin. After the cycle has finished, run multiple spin cycles, incrementally increasing the spin speed each time to remove excess water.
Once the washing cycle is complete, you can proceed to the drying step. If your sleeping bag is still clumped, you can manually break up the clumps of insulation. If you are using a dryer, set it to low heat and add two or three clean tennis balls to help break up the clumps of down. If you are air-drying your sleeping bag, lay it flat on a clean surface in an area with low humidity and no direct sunlight, or hang it up.
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Avoid standard laundry detergent
When washing a down sleeping bag, it is important to avoid using standard laundry detergent. This is because the fillers and optical brighteners in standard laundry detergents can stick to the filaments of the down plumes and feathers, preventing them from lofting. This can result in clumping and reduced loft, which can compromise the insulation of the sleeping bag and make it less effective at trapping body heat.
Instead of using standard laundry detergent, it is recommended to use a gear wash that is specifically formulated for down sleeping bags, such as Nikwax Down Wash Direct, or a product that specifically states it is safe for use on down items. These specialised washes are designed to effectively clean down sleeping bags without causing clumping or reducing loft.
Another option is to use a gentle, non-detergent soap that is made specifically for washing down and synthetic-filled items. These soaps are free of the harsh chemicals found in standard laundry detergents and are less likely to cause clumping or reduce loft. They are also designed to be used in both washing machines and for hand washing, making them a versatile option for cleaning down sleeping bags.
In addition to using the appropriate type of soap or detergent, it is important to follow the manufacturer's instructions for washing down sleeping bags. This typically involves washing the bag in warm or cold water on a gentle cycle and rinsing it at least twice to thoroughly remove any cleaning agent. It is also important to support the entire bag when removing it from the washer and to gently squeeze out excess water before drying.
By avoiding standard laundry detergent and following the recommended care instructions, you can effectively clean your down sleeping bag while maintaining its loft and insulation properties.
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Dry on low heat with tennis balls to prevent clumping
After washing your sleeping bag, it is important to dry it thoroughly before storing it. If your sleeping bag is not dried properly, mould or mildew can form.
Down sleeping bags can take several hours to dry, so it is recommended to use a dryer on low heat. However, if your dryer is too small, you will need to transport your wet bag to a laundromat. If you choose not to use a dryer, you can air-dry your bag by laying it flat on a clean surface in an area with low humidity and no direct sunlight, or you can hang it up.
To speed up the drying process and prevent clumping, you can add two to three clean tennis balls to the dryer with your sleeping bag. The tennis balls will help to break up clumps of down. However, some sources suggest that tennis balls can tear the outer fabric of the sleeping bag, so it is recommended to wait until the down is 90% dry before adding the tennis balls. Alternatively, you can use "dryer balls", which are a similar size and weight to tennis balls but have small spikes that help break up the down clumps.
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Store loosely in a well-ventilated, low-humidity environment
After washing your sleeping bag, it is important to store it loosely in a well-ventilated, low-humidity environment. This is because, if the bag is put away even slightly damp, mould or mildew can form.
If you are going to hang the bag to dry, be careful to distribute the weight so that you do not put too much stress on the nylon fabric. Hanging the bag outside on a clothesline for half a day and flipping it often will ensure any remaining moisture is gone before storing. If you hang it inside, a fan or a dehumidifier can help speed the process.
It is also important to avoid storing your sleeping bag compressed in its stuff sack, as this will eventually damage the fill. Similarly, do not use a waterproof bag for long-term storage, as condensation can build up inside and result in mildew.
The less time your sleeping bag is compressed, the longer it will maintain the loft necessary to keep you warm. Therefore, it is recommended to store your sleeping bag loose, in a cool, dry place.
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Frequently asked questions
No, you should use warm or cold water.
Set your dryer to the lowest heat setting.
Adding 2-4 tennis balls will help to break up clumps of down and speed up the drying process.
A down sleeping bag will take several hours to dry thoroughly.
Machine washing is the best way to wash a sleeping bag. If you are handwashing, do not pick up the bag when it is full of water as it may tear.











































