This set includes 4 pieces of reusable ice packs. They are small, thin, flexible and soft, designed to fit perfectly into lunch boxes, lunch bags and coolers. Made of BPA-free soft gel material, they are safe for contacting with food. These ice packs are leakproof, so you don't need to worry about messy water leakage in your bags. They are ideal for keeping your food and drinks cold during outdoor camping, hiking, picnic and daily lunch outings, and can be reused repeatedly after refreezing.