I don't think you need to do anything really special or anything. I'd just make sure they were really clean and dry before storage. Maybe strip them a bit to remove any detergent build-up and such (just run them through a hot wash or two with nothing but water and maybe some vinegar) just to be sure, but even that probably isn't really necessary. I would just make sure they're not in a really damp & musty basement, but other than that just put them in a box somewhere and they'll be fine I'm sure.

Karen.