If you use disposable bottle liners for freezing breast milk, they may require additional protection to stop leaking and contamination. (verywellfamily.com)
Experts do not recommend disposable plastic bags and bottle liners due to being highly prone to contamination. (newkidscenter.com)
You can use disposable bottle liners throughout the day so that you only need to wash your bottle at the end of the night. (wikihow.com)