REASON YOU WILL NEED BESTMOMS BREAST MILK STORAGE BAG When you done pumping breast milk and there are excesses, you cannot throw the milk away. IT is not every expressed breast milk can baby would be fed immediately, you may decide to store some inside the freezer for later use. if you are resuming work after maternity leave, you will need to build your stash. express and store breast milk that your baby would be fed while you are at work. if you would leave baby in the care of nanny , hubby or grandma, they may need to take milk from the stored milk warm and feed baby. when you are sick , you may may be weak to nurse or pump. baby would be fed from the stored milk until you are strong enough IF you are travelling from one state to another be it by road, or air and you do not know how long you may stay before you are settled enough to start pumping. you will need to freeze your breast milk and travel with the milk frozen so that when you arrive your destination. you can start to feed baby from there until you can pump our breast milk storage bags are strong, leak proof with double zipper closure. your milk can sit inside the freezer for 6 -12 months without leak. yes,. that is how strong our bag it. while using our bags to store milk. you can comfortably lay many bags on top each other and this will give you more storage space you cannot feed baby cold milk right. you will need to thaw the milk then warm before you feed. our bag comes with thermal sensor indicator to guide you on the correct water temperature to warm baby milk. the indicators are pink and blue. when you use hot water which is not too good to warm baby milk. the two indicators pink and blue will disappear. when you use correct water temperature only the pink indicator would remain. when milk is also ready to feed only the pink indicator would remain.  just inform anyone taking care of your new born to watch out of the pink indicator . even if they have not warmed breast milk before. the indicators would guide During storage , you will indicate the date you pumped to enable you start feeding from the oldest date, so that you don't jump the oldest date and feed baby from the newest. the bag has section to record name of baby to let family members know its is baby milk inside. the date you pumped, time you pumped and quantity you pumped . this will help you monitor how baby eats . the bags are not reusable. they are BPA free, came pre sterilized . you do not need to wash before use . it  came sealed. you tear and use. it has label section. so you can monitor the amount of milk you stored EACH box contains 30 pieces inside