Extra ice pack for Pump In Style Advanced and Freestyle portable breastpump cooler bags. Take one with you and leave an extra in the freezer so you're always ready to go. Ice pack safely stores fresh breastmilk for up to 12 hours when ice pack is frounceen solid. Authentic Medela Spare Parts are engineered, tested and approved to work specifically with your Medela breastpump. Non Medela spare parts can vary significantly in design, materials, and workmanship; all of which may affect the performance of your Medela breastpump.