When I had a big chest freezer I stored several shallow supers at a time for months until I was ready to extract. Space in an extra refrigerator might also work (but the frames should be frozen for at least 24 hrs. first to kill potential wax moth eggs, etc.) If you don't have freezer/refrigerator space storing unextracted honey frames/supers for long periods of time can be difficult. They need to be in something air tight so ants, wax moths, and other bugs can't get at them.