The bag's inner part uses safe food-grade material for better insulation. This leak-proof lunch bag suits your warm & cool food. Fully insulated, front pouch and Incredibly spacious lunch bag! ZIPPER CLOSURE, Tear-resistant, lightweight, and waterproof. Great for all day use. Convenient travel, school, work, even picnic trip! Made from heavy weight non-woven cloth fabric, aluminum covered thermal insulation, and featuring a reinforced dual tab zippered top. Folds flat for easy storage in your kitchen, under the car seat, or in your trunk. Smooth sliding zippered lid keeps items from falling out.