Baby Brezza's All-Day Breastmilk Cooler keeps your breastmilk cold for up to 12 hours so you no longer worry that your breastmilk won't stay cold between pumping and refrigerating or freezing! This revolutionary new cooling system holds up to 300ml of breastmilk - which is milk from 2-3 pumping sessions on average! The double-insulated stainless steel thermos holds a 360 degrees ice pack that fully surrounds a 300ml reusable milk storage bottle, ensuring breastmilk remains cold until you can refrigerate or freeze it. It's easy to use - first, freeze the ice pack, then slide the frozen ice pack inside the stainless steel thermos. Simply add the milk storage bottle to keep milk safely chilled for an entire day! (Based on lab testing measuring the time that the coolers maintain breastmilk temperature at refrigerated levels). The internal milk storage bottles are dishwasher-safe. Features a built-in carry handle and twist-on/off lid for convenience and portability on the go, while traveling, or just at home between pumping sessions and a trip to the kitchen! PVC/Lead/Phthalate/Cadmium-FREE. 1 year limited warranty