"Convert your Gentlebottleinto a travel container in seconds. Great for the on-the-go parent. Store breastmilk in the freezer. Made with 100% food-grade SiliconeConverts GentleBottles into travel + storage containersIdeal for freezing breast milkHeat-safe up to 428 DegreeF/220 DegreeCDishwasher & microwave safe (top rack only)Include 4 caps"