I’m probably to late, but I would absolutely double bag if vacuum bagging is not an option, and then heat in 140 degree pan of water. A thermometer is key, but if no thermometer then heat at a low setting, simmering is to high, for an hour or 2. When I don’t have a thermometer, I figure that I can stick my finger in the water for a second or 2, it should be uncomfortable but not burn. Then if good skin is important, remove from the bag and put under the broiler for a few minutes. Crisp skin separates the men from the boys (not meant to be sexist), reheating and getting great skin separates the champions from the novices.
Don’t add a lot of broth or liquid to the bags, it dilutes the flavor.