Best Breast Milk Storage BagsBest Overall:Best Budget:Best Reusable:Best Value Threaded Top:What to ConsiderBreast milk storage bags are all pretty similar, but there are a few things that you do need to think about: materials, sealing method, size of the bag, and how it stores. There are plastic, single-use bags, plastic storage bags that you can sanitize, and food-grade silicone bags that can not only be, but put in a dishwasher. Sealing MethodHow you seal the storage bags is critical for how liquid-tight they will be. How We TestedI did not, in fact, test these with breast milk. First, that ship has sailed and I was glad to see it go; second, you don't just throw bags full of breast milk about all willy nilly.