Basically, you can wash any sleeping bag. Nevertheless, we would recommend washing a sleeping bag as little as possible, i.e. only when it is really dirty. Why? Frequent washing or washing a sleeping bag incorrectly may result in damage to the material, meaning that the sleeping bag will lose its loft. It is not advisable to wash a new sleeping bag. This is not normally necessary and may even lead to the sleeping bag getting its first flaw.
Even if your sleeping bag has small stains or smells musty, this still does not mean it needs a thorough wash. First of all, try getting rid of the stains using a sponge, lukewarm water and a few drops of washing-up liquid.
It helps to hang it out to air on a regular basis, in order to prevent the build-up of any unpleasant odours. Undo the zip of the sleeping bag and hang it out in a dry place as often as possible. Avoid direct sunlight, as the UV rays may damage the material. Hang the sleeping bag on the outside of the tent when you get up in the morning, or hang it over an opened car door.
If you find that you cannot get rid of the stains or odours by these means, then it is advisable to wash the sleeping bag with a special care product. It is generally recommended that sleeping bags are washed after they have been slept in for 50 to 60 nights. If you wear long pyjamas or the sleeping bag has a washable liner (a thin inner sleeping bag) made of ticking, you can delay washing a sleeping bag even longer.