Crisps are generally same-day kind of deserts. Any kind of covering (glass or plastic) will ruin your crunchy topping if left for more than half a day. Of course, you could always leave a top (plastic wrap or dish cover) off of the crisp until reheated. Aluminum foil might be best for this. If not sealed air tight, the warm, damp air from the filing can escape.
Have you thought about a cobbler? A cobbler isn't quite so time sensitive, and travels better.
"Food is our common ground, a universal experience." - James Beard