Answer: The breastmilk storage bags do not expire so they do not have a expiration date. They should last indefinitely if you keep them in a dry atmosphere and unopened.
Beside this, are breast milk storage bags reusable?
The only downside of breast milk storage bags are that they are not reusable (because they are pre-sterilized). Fortunately they are quite cheap to buy in bulk and the fact that they are disposable means less cleaning, which is only a good thing.
Can you use sandwich bags to store breast milk?
Disposable plastic nurser bags or liners for bottles should not be used for storing expressed milk. They are not as durable, are prone to bursting or tearing, are not designed for freezer use, and are not designed for long-term storage. Never use plastic sandwich bags for storing breastmilk.
Can you reuse a bottle of breastmilk?
Reusing expressed breast milk. If your baby doesn't finish a bottle of freshly pumped or refrigerated milk, you can offer it to the baby again at the next feeding. No studies have been done on the safety of using leftover milk; however, various breastfeeding experts indicate that it is likely safe.