So I bought a set to test out as reusable containers for my breast milk and i am not dissapointed!! I love that they're able to hold a good quantity of milk even more so then the baggies and the main reason I got them is because I can easily just wash them and reuse them.... we have a little compartment in our freezer where I have been storing my milk and these fit in their perfectly eventhough they hold more and aren't exactly small they fit perfectly fine and could be easily stacked so I'd say they're the perfect size!! the lid is a twist on so you deff dont have to worry about leaks at all which was another important thing for me very easy to use clean and reuse... the best part is I can use them for this now and later on when needed I can use them for other things so I'll deff be getting my money's worth with them