I received these as samples when I went home from the hospital post delivery. These have been incredibly helpful for milk storage. I have been pumping and storing it here. These are great bottles, sturdy and great quality. I usually pump and freeze the milk. This has been so convenient to use and they have come in so handy during this time. The size is great and enough for one time use. It’s leak proof with a cap which really helps. Cleaning is easy too, you can just rinse or wash it with hot steam if necessary. I have been delivering these to the NICU since my babies are still there and I had absolutely no trouble. These are great storage bottles, I highly recommend.