HI:
I went to a place that did canvas work (tents, sails).
They made a zipper up canvas(ventilated) bag for the Europa.
I push the car in and out easily.
It works great when you are not a 100% sure there will be no vermin (flying or crawling) around.
A couple hand fulls of moth balls in with it and it's been in the cocoon for a year or two with an occasional outing and no issues.