Hi Seth. Ya, a cozy really helps with cook'n up freeze dried and dehydrated meals, especially the latter, as those usually require more and longer heat. You can buy one from Sara Kirkconell at freezerbagcooking.com or make one yourself out of reflectex (a type of mylar bubble wrap available at hardware stores). Just be sure to make it incorporating a flat base so it can stand up, i.e., not envelope style.
I made mine out of two neoprene beer can insulators by unstitching each one and then joining the two together using duct tape. The end result is a cozy that is the exact right size to hold a MH freeze dried dinner! After the requsite 10 - 12 minutes of rehydrating it's still too hot to eat, so be careful.
If you're going to repackage, just be sure to use the freezer grade bags, as they're heavier and less prone to leak.