Ravioli lasagna can be stored in an airtight container or wrapped tightly with plastic wrap and aluminum foil. To maximize freshness, store it in the refrigerator for up to 3 days. For longer storage, you can freeze the lasagna by wrapping it in several layers of plastic wrap and aluminum foil and storing it in an airtight container or freezer bag. If stored correctly, the lasagna should be good for 2-3 months.