KEEP COOL OR WARM EFFECT: Insulated lining can keep bottles cool or warm, which will help your food or drinks keep the optimal temperature. Keep the bottle cool for no less than 5 hours. HIGH-QUALITY MATERIALS: This bottle cooler bag is made of high-quality water-resistant 300D composite oxford fabric, 8mm extra-thick EPE foam, and food-grade PEVA, non-toxic and food-safe. Insulated lining can keep bottles cool or warm, it is a perfect breastmilk cooler tote bag for nursing moms. WATERPROOF & LEAKPROOF: Waterproof fabric is used inside and outside the bag. It is easy to clean the inner, just wipe it off with a cloth or paper towel if liquid spills. Composite Oxford fabric is resistant to water, dirt, and abrasion, protecting items inside. The internal mesh pocket can be used to place ice bags, pacifiers, and other