What are the pros and cons? I normally use the Lansinoh ones because they’ve never leaked, lay flat, measure accurately, and are decently priced and easy to find. I just got these Kiinde brand and I’ve read mixed reviews. I have a Spectra S2 pump so I assume they’re compatible with the pump. I have the whole conversion system. Just wondering if I should save the bags for puréed food later on rather than breast milk.