Maintaining and repairing an MT 900 sleeping bag

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Maintaining and repairing an MT 900 sleeping bag

Do you own one of our MT 900 sleeping bags and have a question about maintaining and repairing it?

We give you all the necessary information so that you can keep your product for a long time.


What is the RDS certification?
What does CUIN mean?
Why can the feathers of my down sleeping bag escape?
How to fold up your sleeping bag
How to properly engage the zip of the sleeping bag
What is the temperature rating? 
What is the limit temperature?
How to avoid feeling cold in your sleeping bag
How to protect yourself from moisture when sleeping under the stars
I have lost my storage bag or my stuff sack



Washing a product that contains feathers is much simpler than it appears, so long as you take a little care: down doesn't go well with water and clumps when it is damp.
As far as possible, avoid washing your feather sleeping bag too often and use a sleeping bag liner.

How to clean a sleeping bag
You will have to fluff up the feathers and down at each stage of the washing process:
- Zip up the sleeping bag and put it in the washing machine
- Add some washing balls or 2 or 3 tennis balls (ideally not brand new balls so that no yellow threads come off).
- Run a cycle at 30°C with your usual washing product (less than the usual quantity) or a special down washing product which preserves its insulating properties
- Rinse twice and set a very delicate spin cycle so that the feathers do not clump together


This advice applies to every type of sleeping bag: it is best to store it uncompressed in the bag provided.
Keeping the sleeping bag compressed in its storage bag can damage the feathers and down, which will lose their fill power. Down does not react well to being compressed for long periods of time.

There are two solutions possible:
- use a storage bag that is bigger than the stuff sack, to preserve the fill power of your sleeping bag,
- hang your sleeping bag on a hanger, like a pair of trousers.

Restoring the water repellent property of your sleeping bag

Over time, the application to make your sleeping bag water repellent may deteriorate. However, it is quite possible to reactivate the water repellency using a re-waterproofing liquid.


Sometimes, your sleeping bag may have a snag. It is important to repair snags quickly using a patch so that the feathers cannot escape and the thermal insulation of the sleeping bag is preserved.

Choosing to repair it means acting collectively to reduce our impact by extending the life of our products.
The Decathlon store workshops can repair the snag in your sleeping bag. Check out below the service that you can request from your nearest store.
NB: not all stores are equipped to carry out the repair locally. In this case, your product will be sent to a regional workshop and will be kept for a longer period of time before you can recover it.
> To apply the patch, our workshops carry out a heat sealing process.The resulting high-quality patch will extend the lifetime of your sleeping bag and preserve the warranty. However, if you decide to repair your sleeping bag yourself, the product warranty will no longer be valid.

Patching - Decathlon workshop


On a trek, you may snag a sleeping bag. The good news is that it can be repaired! Indeed, you can either mend it or patch it so that the tear doesn't get any bigger letting the synthetic fibres or feathers escape.

- You want the repair to be inconspicuous, even pretty?
If the fabric isn't too thin and you know how to sew, take the time to sew up the hole with some thread in a colour that matches that of the outer fabric of the sleeping bag.
When sewing, take care not to go through the other side of the sleeping bag. This would create a thermal bridge and reduce the insulation of the sleeping bag.

- You’re short of time and have no sewing skills?
The sticky repair patch comes to your rescue: cut a round-edged rectangle one or two centimetres larger than the size of the snag, glue it to the clean, flattened fabric and it's done - you're good to go!


Have you stopped using your sleeping bag and are wondering what to do with it?
Instead of throwing it away, don't hesitate to resell it second-hand using the Decathlon Second-hand platform! Fill in all the information about your product online. We will therefore offer you the best sales solutions, then you can drop off your product in the store to finalize the procedure.