You can prep the filling ahead of time. This way all you have to do is roll them up and cook them. It is best to roll them right before cooking so the wrappers don't get soggy. If you prep the filling ahead of time, you can store it in an airtight container in the fridge for up to 4 days before you wrap and cook your egg rolls. You can also prep and cook them ahead of time. Once cooked, they won't get soggy when stored. You can store them in an airtight container in the fridge for up to 4 days or in the freezer for up to 3 months. Reheat in the oven or by pan-frying them in cooking spray just until warmed through.