Simba Standing Zip Up Breast Milk Storage Bag is a great handy product for breast feeding mums. It has been Gamma Ray pre-sterilized and double zipped to prevent any leakage of precious breast milk. It also enables labelling of dates so that you can identity which bag to use in advance. With a patented easy tearing dotted line, it makes the whole storage process simpler. It also has patented spout ventilating stripes to enable fluent milk flow and prevent clung spout.