
Sleeping bags should be washed at least once a year to prevent dirt, grime, and oils from building up and reducing the bag's insulating power. After washing, sleeping bags should be dried thoroughly to prevent mildew from forming. Depending on the type of sleeping bag, the drying process can take anywhere from one to several hours. This article will provide a step-by-step guide on how to dry a sleeping bag after washing to ensure it is clean, dry, and ready for your next adventure.
How to dry a sleeping bag after washing:
| Characteristics | Values |
|---|---|
| Drying time | 2-3 hours for synthetic bags, longer for down bags |
| Drying method | Air dry, tumble dry, dryer |
| Air drying instructions | Lay the bag flat on a clean surface outside, such as grass or a beach towel, in the sun or partial shade |
| Tumble drying instructions | Use a commercial-size dryer or a home dryer on a low heat setting |
| Dryer instructions | Use a commercial-size dryer or a dryer with a large capacity |
| Dryer temperature | Low heat |
| Dryer time | At least one hour |
| Additional items | 3-5 tennis balls, dryer balls, or clean sneakers to break up clumps of insulation |
| Rinsing | Rinse at least twice or run a second complete wash-and-rinse cycle without soap to ensure all soap residue is removed |
| Drying location | Hang the bag up for a few days to allow any remaining moisture to dry |
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What You'll Learn

Use a tumble dryer on a low heat setting
If you want to dry your sleeping bag in a tumble dryer, there are several things to keep in mind. Firstly, it is recommended to use a commercial-size dryer if possible, as these have larger capacities that allow fully lofted sleeping bags to tumble. If you don't have access to a commercial dryer, you can use a home dryer, but it's important to set it to a low heat setting. High heat can melt delicate nylon fabrics.
Before placing your sleeping bag in the tumble dryer, it's important to check the cleaning instructions on the label, as different bags may have specific requirements. Once you've confirmed that tumble drying on low heat is safe, you can proceed to the next steps.
To prevent the feathers or filling from clumping together during the drying process, it's recommended to add a few tennis balls, wool dryer balls, or clean sneakers into the dryer along with the sleeping bag. If using shoes, wrap them in socks to prevent the tread from tearing your sleeping bag. Alternatively, you can use heavy socks balled up to achieve a similar effect.
Set the dryer to a low heat setting and allow the sleeping bag to tumble dry for at least an hour. The duration may vary depending on the size and type of your sleeping bag, so it's important to refer to the manufacturer's instructions. Make sure to keep an eye on the dryer to prevent over-drying, which can damage the bag.
After tumble drying, remove the sleeping bag from the dryer and check for any remaining clumps. If necessary, manually break up any clumps of insulation to ensure even distribution. You can also hang the bag up for a few days to allow any remaining moisture to evaporate.
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Air dry on a flat surface
If you don't want to use a dryer for your sleeping bag, air drying on a flat surface is a good option. This method will take several hours, so be prepared to wait a while for your sleeping bag to dry.
To start, lay your sleeping bag flat on a clean surface outside. This could be on the grass or a beach towel, and in the sun or partial shade. It's important to ensure that the surface is clean and dry to avoid any dirt or moisture transferring to your sleeping bag.
When placing the sleeping bag down, it's a good idea to unzip it completely. This will help the sleeping bag dry more evenly and prevent any snagging or breaking of the zipper. You may also want to turn the bag inside out to help the inside dry more effectively.
While air drying, you may need to manually break up clumps of insulation in your bag. This will help the bag dry more evenly and maintain its insulating properties. You can do this by gently tearing apart the lumps and redistributing the filling.
Finally, remember to let the sleeping bag dry completely before storing it. This may take a couple of days, and it's important to be careful when handling the damp bag, as the seams can split.
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Use a commercial-size dryer
If you have access to a commercial-size dryer, this is ideal for drying your sleeping bag. The larger capacity of a commercial dryer allows fully lofted sleeping bags to tumble, which is essential for preventing clumping and ensuring your bag dries thoroughly.
If you are drying a down sleeping bag, it is particularly important to use a dryer with a large capacity, as down sleeping bags are more prone to clumping. The large capacity of a commercial-size dryer will allow the down to loft and tumble, preventing clumps and ensuring your bag dries evenly.
When using a commercial-size dryer, be sure to set the dryer to low heat. High heat can melt delicate nylon fabrics. It is also a good idea to put a few tennis balls, wool dryer balls, or rolled-up socks into the dryer with your sleeping bag. These items help to further prevent clumping by breaking up the insulation as the bag dries.
If your sleeping bag is made of down, it is important to allow it to dry for a long time. Down sleeping bags can take several hours to dry thoroughly. If you don't have access to a commercial-size dryer, consider using a dryer at a laundromat. These dryers tend to have larger capacities than home dryers and can be a good option if you don't have access to a commercial-size machine.
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Avoid dry cleaning
It is recommended that you avoid dry cleaning your sleeping bag. The industrial solvents used in dry cleaning are harsh and can strip the natural oils of down that help it retain loft. This will negatively impact the insulating power of the bag.
If you are looking to clean your sleeping bag, it is recommended to wash it yourself or send it to a professional cleaning service. If you choose to wash it yourself, you can use a bathtub or a front-loading commercial washer at a laundromat. If you use a washing machine, ensure that you use a gentle, non-detergent soap that is made for washing down- and synthetic-filled items. If you hand wash, use a gear wash that is specifically formulated for down, like Nikwax Down Wash Direct.
After washing, it is important to dry your sleeping bag thoroughly. You can use a dryer on a low heat setting, or air dry it in the sun. If using a dryer, it is recommended to use tennis balls or dryer balls to help break up the clumps of insulation. If you air dry your sleeping bag, lay it flat on a clean surface and manually break up any clumps of insulation as it dries.
It is important to note that washing a sleeping bag subjects it to wear and tear and decreases its loft. Therefore, it is recommended to only wash your sleeping bag once a year, or more frequently if you are using it often. Additionally, always consult the care instructions provided by the manufacturer of your sleeping bag before cleaning it.
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Use tennis balls to break up clumps
Drying a sleeping bag can be a challenge due to its bulk and the potential for clumping, especially when using a tumble dryer. To speed up the drying process and ensure your bag is fluffed and clump-free, it is recommended to use tennis balls. Ordinary tennis balls can be used, but specialty dryer balls made from wool or plastic are also an option and can be found at most laundry stores. These balls are designed to circulate air and fluff your laundry, but tennis balls work just as well and are a common household item. Place three to four tennis balls in a standard-sized dryer, and for larger sleeping bags, you may want to use up to six balls. The balls will need to be cleaned first; a simple wipe down with a damp cloth will suffice. Ensure the sleeping bag is evenly distributed in the dryer, then set it to tumble dry on a low heat setting. The heat is important—you don't want to damage or shrink the bag—so always refer to the care instructions on your specific bag. As the dryer tumbles, the tennis balls will bounce around, breaking up any clumps of down or filling and keeping the bag's contents loose and fluffy. The balls will also help to absorb any remaining moisture and speed up the overall drying time. For best results, it is recommended to pause the dryer every 30 minutes to 1 hour to remove the balls, give them a wipe down, and then replace them and restart the dryer. This will ensure the sleeping bag dries evenly and any clumps are effectively broken up. This method is a tried and true way to get your sleeping bag ready for your next adventure, and it will be good as new in no time!
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Frequently asked questions
Drying a sleeping bag can take anywhere from one hour to several hours, depending on the filling and the method used. Synthetic bags will dry a lot quicker than down bags.
It is recommended to use a dryer on a low-heat setting to dry your sleeping bag. The tumbling action of the dryer will help to fluff out the filling and prevent clumping. If you don't have access to a dryer, you can lay the bag flat on a clean surface outside to air dry, but this will take significantly longer, and you may need to manually break up clumps of insulation.
Make sure your sleeping bag is completely dry before storing it. Mildew can form if moisture is trapped inside the filling, and it can be very difficult to remove.











































