Nuk Seal"N Go Disposable Liner Nuk Seal"N Go Disposable Liner makes it easier to store breast milk. The bags are leak-proof and double sealed with a zipper. They are also freezer-safe, self-standing and can be used with disposable bottle holders. Features Leak-proof double sealed bags with zipper Better bag sealing system Freezer-safe Self-standing bag Can be used with disposable bottle holders