I was looking for a word to describe a sort of cloth sheath you could use to store a boule de pétanque. I found myself in the strange position of knowing the appropriate word in French (housse) and in Spanish (funda) but not in my native language. Both these words basically mean a covering. Those are the words used in their respective languages for a (hard or soft) guitar case for example.
I was imagining a kind of form-fitting sock that the boule could be put in. The image I have in mind is something like the socks sold as protective covers for mobile phones:
What would that be called in English? I tried dictionary translation but got things like sheath, slipcover and dust cover. Sheath does not work on a sphere and the other two don't work for me in this context either (please let me know if you disagree).
The best I could come up with is a jacket but again, not as general as case. Basically I am looking for a word that would describe a form fitting, soft protective cover without implying hardness (case), a particular shape (sheath) or a specific use (dust cover makes me think of machinery and slipcover of furniture).
EDIT: I just thought of sleeve as in record sleeve but I am not sure that I've ever heard it used outside the context of records or CDs or disks in general. That's the type of thing I am looking for though, something that is used more to protect than to transport.
If you believe that one of the words I have mentioned is the best fit, please let me know. I feel they are not suited but am quite willing to accept I'm wrong on this one.