The reusable storage bags are made of eco-friendly PEVA material which is PVC-free, lead-free, chloride-free and BPA-free. It is safe and can store food well and keep it fresh. Can be heated or refrigerated. The food bags are reusable as they are very strong and durable, so you can use them over and over again. Orders of 3000 pieces or greater are eligible for sea shipping. 100% guarantee for quality.