Fresh milk should be stored in containers or bags that are designed specifically for breastmilk storage. Bottles are available in glass or plastic, many of which are now BPA free. Special storage bags and breastmilk freezer tray systems are ideal for freezing milk for later use. When freezing, don't fill containers right up as liquid expands when frozen.
It's best to freeze milk in small quantities to minimise waste and for easier thawing. Always remember to label and date frozen breastmilk, and add baby's full name and your phone number if taking milk to a day care centre, sitter or hospital.