Medela's Breast Milk Collection & Storage Bottles is ideal for moms in need of extra breast milk bottles to meet their growing and changing breast milk supply. Convenient extra containers to pump into for fast, easy breast milk storage. Freezer and dishwasher safe. Compatible with Calma, this collection is a perfect complement to your Medela breast pump. Medela's Breast Milk Collection & Storage Bottles come with six bottles and lids, one bonus Quick Clean Micro-Steam Bag for daily disinfecting of bottles and accessories.