Verified answer

Don't wrap it in foil, since it will absorb a metal-y taste. I prefer using a sandwich or ziploc baggy, myself. If you put it in a sandwich case, even with a paper towel the case might get sticky... If you can wrap the it in saran wrap well so it doesn't fall out, then that's my choice, if you don't mind it getting smushed.

Saran wrap, ziploc bag, or plastic tupperware.

It's peanut butter jelly time