Roadside and corner stands with a propane chile roaster are becoming familiar sites in places that three years ago had never heard the word relleno . When you roast chile or have it roasted, do not carry the chile in a plastic garbage bag. These bags often have insecticides or deodorizers incorporated in the plastic. If the bag has powder of some kind it is dangerous to your health. A good container is an old pillow case.
Garbage bags are for garbage.
Some wholesale food processors may have food grade plastic bags available. After that time, it could begin to spoil. Cool the chile as soon as possible, even placing it in a shallow pan will help. When thawed, the skins will easily come off. Frozen and home canned chile should be kept no more than 12 months.