1. Reusable and food-grade materials: Made from food-grade PEVA material and certified through testing to ensure that the reusable food storage bags are free of BPA, PVC, chlorides, and lead. They have no silicone or plastic odor and are suitable for household use. 2. Leak-proof and easy to seal: The reusable lunch bags adopt an improved sealing technology, which is more airtight, leak-proof, waterproof, and hygienic, making them very suitable for food storage and preservation. The improved double zippers and anti-slip design make the reusable sandwich bags easier for children to open or close. The reusable sandwich bags with colored double zippers make your life more interesting and wonderful. 3. Freezer-safe and easy to clean: The reusable freezer bags can prevent freezer burn and keep food fresh and delicious, making them very suitable for freezing meat, chicken, fish, fruits, and vegetables. We recommend hand-washing because dishwashers can damage the double seals of the food storage bags. They can be easily cleaned with a baby bottle brush and dried by placing the bags on a cup or mug. 4. Multi-purpose: The reusable bags feature a three-dimensional design, which can fit well in the refrigerator and hold more food. The reusable sandwich bags are perfect containers for sandwiches, snacks, lunches, vegetables, fruits, baby food, cosmetics, jewelry, makeup, stationery, travel, etc.