For storage I gently fold them into big rectangular plastic bins with covers.
You may want to wrap them around pool noodles at the folds to avoid creases.
Anything with raw rubber (boots), I put talc on it, moisture is what destroys raw rubber, and put them in a zip-lock bag with a (reusable) desiccant. (same with all the spare/unused computer gear with rubber: mice, pads, joysticks...)
Here is the wood+pool noodle hanger I made to make them dry.
Note that I use a disco ball motor to make it spin and provide air circulation.