These boxes are perfect. They help prepare the doses of the day in advance and are ideal for going out. I used me for the nurse but for me it is better than managing pods with baby in her arms at the last minute !! Perfectly sealed: a cover + screwing between the boxes. The spout is most compared to other products I have seen.
2 bémoles less serious: there are only 4 boxes, so you must see at least 2 rounds 3 to 6 bottles and always have available the dry time as the other, or to advance; they are not opaque ... but that does not seem to affect the storage of milk.