Quick Answer
Mylar bags do not significantly affect the taste of stored foods over time, but can impart a mild metallic flavor if not properly sealed or if the contents come into contact with the bag's coating.
Chemical Contamination Risks
Mylar bags, also known as boPET (Biaxially-oriented polyethylene terephthalate) bags, are made from a type of polyester film. When not sealed properly, or if the contents come into contact with the bag’s coating, chemicals like bisphenol A (BPA) can leach into the stored food. BPA is a known endocrine disruptor that can affect the taste and quality of the food.
Sealing Techniques to Prevent Contamination
To prevent chemical contamination, it’s essential to seal Mylar bags properly. A good seal can be achieved using a heat sealer or a FoodSaver vacuum sealer. When using a heat sealer, set the temperature to around 250-300°F (120-150°C) for 2-3 seconds to create an airtight seal. For vacuum sealers, use the recommended settings and ensure the bag is completely sealed before storing the contents.
Storage Conditions and Shelf Life
Proper storage conditions, such as a cool, dry place or a root cellar, can also impact the taste and shelf life of stored foods. Store Mylar bags in a way that prevents moisture or light from reaching the contents, and check on them regularly for signs of degradation. With proper storage and sealing techniques, Mylar bags can help preserve foods for 20-30 years or more, without significantly affecting their taste.
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